tidy-up: delete unused build configuration macros

Most of them feature guards:

- `CURL_INCLUDES_SYS_UIO` [1]
- `HAVE_ALLOCA_H` [2]
- `HAVE_CRYPTO_CLEANUP_ALL_EX_DATA` (unuse

tidy-up: delete unused build configuration macros

Most of them feature guards:

- `CURL_INCLUDES_SYS_UIO` [1]
- `HAVE_ALLOCA_H` [2]
- `HAVE_CRYPTO_CLEANUP_ALL_EX_DATA` (unused since de71e68000c8624ea13f90b136f8734dd0fb1bdc)
- `HAVE_DLFCN_H`
- `HAVE_DLOPEN`
- `HAVE_DOPRNT`
- `HAVE_FCNTL`
- `HAVE_GETHOSTBYNAME` [3]
- `HAVE_GETOPT_H`
- `HAVE_GETPASS`
- `HAVE_GETPROTOBYNAME`
- `HAVE_GETSERVBYNAME`
- `HAVE_IDN_FREE*`
- `HAVE_INET_ADDR`
- `HAVE_IOCTL`
- `HAVE_KRB4`
- `HAVE_KRB_GET_OUR_IP_FOR_REALM`
- `HAVE_KRB_H`
- `HAVE_LDAPSSL_H`
- `HAVE_LDAP_INIT_FD`
- `HAVE_LIBDL`
- `HAVE_LIBNSL`
- `HAVE_LIBRESOLV*`
- `HAVE_LIBUCB`
- `HAVE_LL`
- `HAVE_LOCALTIME_R`
- `HAVE_MALLOC_H`
- `HAVE_MEMCPY`
- `HAVE_MEMORY_H`
- `HAVE_NETINET_IF_ETHER_H`
- `HAVE_NI_WITHSCOPEID`
- `HAVE_OPENSSL_CRYPTO_H`
- `HAVE_OPENSSL_ERR_H`
- `HAVE_OPENSSL_PEM_H`
- `HAVE_OPENSSL_PKCS12_H`
- `HAVE_OPENSSL_RAND_H`
- `HAVE_OPENSSL_RSA_H`
- `HAVE_OPENSSL_SSL_H`
- `HAVE_OPENSSL_X509_H`
- `HAVE_PEM_H`
- `HAVE_POLL`
- `HAVE_RAND_SCREEN`
- `HAVE_RAND_STATUS`
- `HAVE_RECVFROM`
- `HAVE_SETSOCKOPT`
- `HAVE_SETVBUF`
- `HAVE_SIZEOF_LONG_DOUBLE`
- `HAVE_SOCKIO_H`
- `HAVE_SOCK_OPTS`
- `HAVE_STDIO_H`
- `HAVE_STRCASESTR`
- `HAVE_STRFTIME`
- `HAVE_STRLCAT`
- `HAVE_STRNCMPI`
- `HAVE_STRNICMP`
- `HAVE_STRSTR`
- `HAVE_STRUCT_IN6_ADDR`
- `HAVE_TLD_H`
- `HAVE_TLD_STRERROR`
- `HAVE_UNAME`
- `HAVE_USLEEP`
- `HAVE_WINBER_H`
- `HAVE_WRITEV`
- `HAVE_X509_H`
- `LT_OBJDIR`
- `NEED_BASENAME_PROTO`
- `NOT_NEED_LIBNSL`
- `OPENSSL_NO_KRB5`
- `RECVFROM_TYPE*`
- `SIZEOF_LONG_DOUBLE`
- `STRERROR_R_TYPE_ARG3`
- `USE_YASSLEMUL`
- `_USRDLL` (from CMake) [4]

[1] Related parts in `m4/curl-functions.m4` and `configure.ac` might
also be deleted.

[2] Related comment can possibly be deleted in
`packages/vms/generate_config_vms_h_curl.com`.

[3] There are more instances of this in autotools, but I did not dare to
touch those. Looked like it's used to detect socket support.

[4] This is necessary for MFC (Microsoft Foundation Class) DLLs to
force linking MFC components statically to the DLL. `libcurl.dll`
does not use MFC, so we can delete this define.
Ref: https://docs.microsoft.com/cpp/build/regular-dlls-statically-linked-to-mfc

Script that can help finding unused settings like above:
```shell

autoheader configure.ac # generate lib/curl_config.h.in

{
grep -o -E 'set\([A-Z][A-Z0-9_]{3,}' CMake/Platforms/WindowsCache.cmake | sed -E 's|set\(||g'
grep -o -E -h '#define +[A-Z][A-Z0-9_]{3,}' lib/config-*.h | sed -E 's|#define +||g'
grep -o -E '#cmakedefine +[A-Z][A-Z0-9_]{3,}' lib/curl_config.h.cmake | sed -E 's|#cmakedefine +||g'
grep -o -E '#undef +[A-Z][A-Z0-9_]{3,}' lib/curl_config.h.in | sed -E 's|#undef +||g'
} | sort -u | grep -v -F 'HEADER_CURL_' | while read -r def; do
c="$(git grep -w -F "${def}" | grep -v -E -c '(/libcurl\.tmpl|^lib/config-|^lib/curl_config\.h\.cmake|^CMakeLists\.txt|^CMake/Platforms/WindowsCache\.cmake|^packages/vms/config_h\.com|^m4/curl-functions\.m4|^acinclude\.m4|^configure\.ac)')"
if [ "${c}" = '0' ]; then
echo "${def}"
fi
done
```

Reviewed-by: Daniel Stenberg
Closes #9044

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build: improve OS string in CMake and `config-win32.h`

This patch makes CMake fill the "OS string" with the value of
`CMAKE_C_COMPILER_TARGET`, if passed. This typically contains a tripl

build: improve OS string in CMake and `config-win32.h`

This patch makes CMake fill the "OS string" with the value of
`CMAKE_C_COMPILER_TARGET`, if passed. This typically contains a triplet,
the same we can pass to `./configure` via `--host=`.

For non-CMake, non-autotools, Windows builds, this patch adds the ability
to override the default `OS` value in `lib/config-win32.h`.

With these its possible to get the same OS string across the three build
systems.

This patch supersedes the earlier, partial, CMake-only solution:
435f395f3f8c11eebfcc243ca55ebcc11a19b8b8, thus retiring the
`CURL_OS_SUFFIX` CMake option.

Reviewed-by: Jay Satiro
Closes #9117

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curl_setup: include _mingw.h

Prior to this change _mingw.h needed to be included in each unit before
evaluating __MINGW{32,64}_xxx_VERSION macros since it defines them. It
is include

curl_setup: include _mingw.h

Prior to this change _mingw.h needed to be included in each unit before
evaluating __MINGW{32,64}_xxx_VERSION macros since it defines them. It
is included only in some mingw headers (eg stdio.h) and not others
(eg windows.h) so it's better to explicitly include it once.

Closes https://github.com/curl/curl/pull/9036

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copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the

copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the file
`.reuse/dep5`.

This commit also adds a Github workflow to check pull requests and adapts
copyright.pl to the changes.

Closes #8869

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misc: remove the final watcom references

Follow-up to bbf8cae44dedc495e6

We removed support for the watcom builds files back in September
2020. This removes all remaining watcom

misc: remove the final watcom references

Follow-up to bbf8cae44dedc495e6

We removed support for the watcom builds files back in September
2020. This removes all remaining watcom references and ifdefs.

Closes #8287

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config: remove `HAVE_WINSOCK_H` definition

It's not used anymore.

Closes https://github.com/curl/curl/pull/7795

Revert "build: remove checks for WinSock 1"

Due to CI issues

This reverts commit c2ea04f92b00b6271627cb218647527b5a50f2fc.

Closes #7790

build: remove checks for WinSock 1

It's not supported anymore.

Closes https://github.com/curl/curl/pull/7778

Get rid of the unused HAVE_SIG_ATOMIC_T et. al.

It was added in 2006 but I see no evidence it was ever used.

cmake: fix support for UnixSockets feature on Win32

Move the definition of sockaddr_un struct from config-win32.h to
curl_setup.h, so that it could be shared by all build systems.

cmake: fix support for UnixSockets feature on Win32

Move the definition of sockaddr_un struct from config-win32.h to
curl_setup.h, so that it could be shared by all build systems.

Add ADDRESS_FAMILY typedef for old mingw, now old mingw can also use
unix sockets.

Also fix the build of tests/server/sws.c on Win32 when USE_UNIX_SOCKETS
is defined.

Closes #7034

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configure/cmake: remove checks for unused gethostbyaddr and gethostbyaddr_r

Closes #7276

configure/cmake: remove unused define HAVE_PERROR

Closes #7276

configure/cmake: remove checks for unused sgtty.h

Closes #7276

configure/cmake: remove remaining checks for err.h

Closes #7276

configure/cmake: remove remaining checks for crypto.h

Closes #7276

config: remove now-unused macros

Closes #7094

configure: remove use of RETSIGTYPE

This was previously defined by the obsolete AC_TYPE_SIGNAL macro,
which was removed in 2682e5f5. The deprecation text says

> Your code may sa

configure: remove use of RETSIGTYPE

This was previously defined by the obsolete AC_TYPE_SIGNAL macro,
which was removed in 2682e5f5. The deprecation text says

> Your code may safely assume C89 semantics that RETSIGTYPE is void.

So, remove it and just use void instead.

Closes #6861

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mingw: enable using strcasecmp()

This makes the 'Features:' list sorted case-insensitively,
bringing output in-line with *nix builds.

Reviewed-by: Jay Satiro
Closes #6644

build: delete unused feature guards

- `HAVE_STRNCASECMP`
- `HAVE_TCGETATTR`
- `HAVE_TCSETATTR`

Reviewed-by: Jay Satiro
Reviewed-by: Daniel Stenberg
Closes #6645

time: enable 64-bit time_t in supported mingw environments

(Unless 32-bit `time_t` is selected manually via the `_USE_32BIT_TIME_T`
mingw macro.)

Previously, 64-bit `time_t` was

time: enable 64-bit time_t in supported mingw environments

(Unless 32-bit `time_t` is selected manually via the `_USE_32BIT_TIME_T`
mingw macro.)

Previously, 64-bit `time_t` was enabled on VS2005 and newer only, and
32-bit `time_t` was used on all other Windows builds.

Assisted-by: Jay Satiro
Closes #6636

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curl.se: new home

Closes #6172

windows: disable Unix Sockets for old mingw

Classic mingw and 10y+ old versions of mingw-w64 don't ship with
Windows headers having the typedef necessary for Unix Sockets
support, so

windows: disable Unix Sockets for old mingw

Classic mingw and 10y+ old versions of mingw-w64 don't ship with
Windows headers having the typedef necessary for Unix Sockets
support, so try detecting these environments to disable this
feature.

Ref: https://sourceforge.net/p/mingw-w64/mingw-w64/ci/cf6afc57179a5910621215f8f4037d406892072c/

Reviewed-by: Daniel Stenberg

Fixes #5674
Closes #5758

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source cleanup: remove all custom typedef structs

- Stick to a single unified way to use structs
- Make checksrc complain on 'typedef struct {'
- Allow them in tests, public heade

source cleanup: remove all custom typedef structs

- Stick to a single unified way to use structs
- Make checksrc complain on 'typedef struct {'
- Allow them in tests, public headers and examples

- Let MD4_CTX, MD5_CTX, and SHA256_CTX typedefs remain as they actually
typedef different types/structs depending on build conditions.

Closes #5338

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windows: enable UnixSockets with all build toolchains

Extend existing unix socket support in Windows builds to be
enabled for all toolchain vendors or versions. (Previously
it was on

windows: enable UnixSockets with all build toolchains

Extend existing unix socket support in Windows builds to be
enabled for all toolchain vendors or versions. (Previously
it was only supported with certain MSVC versions + more recent
Windows 10 SDKs)

Ref: https://devblogs.microsoft.com/commandline/af_unix-comes-to-windows/
Ref: https://github.com/curl/curl/issues/5162
Closes: https://github.com/curl/curl/pull/5170

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config-win32: Windows does not have ftruncate