tidy-up: misc spelling (bit, ASCII)

Closes #14559

tidy-up: more whitespace

Closes #14014

openvms: look for `USE_IPV6` in `config.h` (was: `ENABLE_IPV6`)

The OpenVMS script `config_h.com` is parsing the config header
generated by autotools. Let's make it look for the macro na

openvms: look for `USE_IPV6` in `config.h` (was: `ENABLE_IPV6`)

The OpenVMS script `config_h.com` is parsing the config header
generated by autotools. Let's make it look for the macro name we now
use universally across the codebase.

Follow-up to e411c98f702f0fb38dceec95e7507ef15a00d12c #13349
Closes #13360

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build: delete unused `HAVE_{GSSHEIMDAL,GSSMIT,HEIMDAL}`

Stop setting `HAVE_GSSHEIMDAL`, `HAVE_GSSMIT` and `HAVE_HEIMDAL`.
There was no place in the build system or source code that used

build: delete unused `HAVE_{GSSHEIMDAL,GSSMIT,HEIMDAL}`

Stop setting `HAVE_GSSHEIMDAL`, `HAVE_GSSMIT` and `HAVE_HEIMDAL`.
There was no place in the build system or source code that used them.

Reviewed-by: Daniel Stenberg
Closes #12506

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copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- save

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- saves us from pointless churn
- git keeps history for us
- the year range is kept in COPYING

checksrc is updated to allow non-year using copyright statements

Closes #10205

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vms: remove SIZEOF_SHORT

The rest of SIZEOF_SHORT was removed in d48dd15.

See #9291
Closes #10061

functypes: provide the recv and send arg and return types

This header is for providing the argument types for recv() and send()
when built to not use a dedicated config-[platfor].h file.

functypes: provide the recv and send arg and return types

This header is for providing the argument types for recv() and send()
when built to not use a dedicated config-[platfor].h file.

Remove the slow brute-force checks from configure and cmake.

This change also removes the use of the types for select, as they were
not used in code.

Closes #9592

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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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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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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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misc: assorted typo fixes

Closes #6375

copyright: fix out-of-date copyright ranges and missing headers

Reported by the new script 'scripts/copyright.pl'. The script has a
regex whitelist for the files that don't need copyrigh

copyright: fix out-of-date copyright ranges and missing headers

Reported by the new script 'scripts/copyright.pl'. The script has a
regex whitelist for the files that don't need copyright headers.

Removed three (mostly usesless) README files from docs/

Closes #5141

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define: remove HAVE_ENGINE_LOAD_BUILTIN_ENGINES, not used anymore

It is covered by USE_OPENSSL_ENGINE now.

Reported-by: Gisle Vanem
Bug: https://github.com/curl/curl/commit/87b9

define: remove HAVE_ENGINE_LOAD_BUILTIN_ENGINES, not used anymore

It is covered by USE_OPENSSL_ENGINE now.

Reported-by: Gisle Vanem
Bug: https://github.com/curl/curl/commit/87b9337c8f76c21c57b204e88b68c6ecf3bd1ac0#commitcomment-36447951

Closes #4725

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openssl: define HAVE_SSL_GET_SHUTDOWN based on version number

Closes #4100

spelling fixes

Detected using the `codespell` tool.

Also contains one URL protocol upgrade.

Closes https://github.com/curl/curl/pull/2334

code/docs: Use Unix rather than UNIX to avoid use of the trademark

Use Unix when generically writing about Unix based systems as UNIX is
the trademark and should only be used in a partic

code/docs: Use Unix rather than UNIX to avoid use of the trademark

Use Unix when generically writing about Unix based systems as UNIX is
the trademark and should only be used in a particular product's name.

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VMS: fix and generate the VMS build config

config_h.com is a new file that generates a config.h file based on the
curl_config.h.in file and a quick scan of the configure script. This is

VMS: fix and generate the VMS build config

config_h.com is a new file that generates a config.h file based on the
curl_config.h.in file and a quick scan of the configure script. This is
actually a generic procedure that is shared with other VMS packages.

The existing pre-built config-vms.h had over 100 entries that were not
correct and in some cases conflicted with the build options available in
the build_vms.com.

generate_config_vms_h_curl.com is a helper procedure to the
config_h.com. It covers the cases that the generic config_h.com is not
able to figure out, and accepts input from the build_vms.com procedure.

build_curlbuild_h.com is a new file to generate the curlbuild.h file
that Curl is now using when it is using a curl_config.h file.

post-config-vms.h is a new file that is needed to provide VMS specific
definitions, and most of them need to be set before the system header
files are included.

The VMS build procedure is fixed:

1. Fixed to link in the correct HP ssl library.
2. Fixed to detect if HP Kerberos is installed.
3. Fixed to detect if HP LDAP is installed.
4. Fixed to detect if gnv$libzshr is installed.
5. Simplified the input parameter parsing to not use a loop.
6. Warn that 64 bit pointer option support is not complete
in comments.
7. Default to IEEE floating if platform supports it so
resulting libcurl will be compatible with other
open source projects on VMS.
8. Default to LARGEFILE if platform supports it.
9. Default to enable SSL, LDAP, Kerberos, libz
if the libraries are present.
10. Build with exact case global symbols for libcurl.
11. Generate linker option file needed.
12. Compiler list option only commonly needed items.
13. fulllist option for those who really want it.
14. Create debug symbol file on Alpha, IA64.

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