misc: remove BeOS code and references

There has not been a mention of this OS in any commit since December
2004 (58f4af7973e3d2). The OS is also long gone.

Closes #8288

build: enable -Warith-conversion

This makes the behavior consistent between GCC 10 and earlier versions.

Closes https://github.com/curl/curl/pull/8271

build: fix -Wenum-conversion handling

Don't enable that warning when warnings are disabled.
Also add it to CMake.

Closes https://github.com/curl/curl/pull/8271

cmake: warn on use of the now deprecated symbols

Follow-up to 9108da2c26d

Closes #8052

cmake: private identifiers use CURL_ instead of CMAKE_ prefix

Since the 'CMAKE_' prefix is reserved for cmake's own private use.
Ref: https://cmake.org/cmake/help/latest/manual/cmake-var

cmake: private identifiers use CURL_ instead of CMAKE_ prefix

Since the 'CMAKE_' prefix is reserved for cmake's own private use.
Ref: https://cmake.org/cmake/help/latest/manual/cmake-variables.7.html

Reported-by: Boris Rasin
Fixes #7988
Closes #8044

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cmake: fix error getting LOCATION property on non-imported target

Closes #7885

CMake: restore support for SecureTransport on iOS

Restore support for building curl for iOS with SecureTransport enabled.

Closes #7501

cmake: add CURL_ENABLE_SSL option and make CMAKE_USE_* SSL backend options depend on it

Closes https://github.com/curl/curl/pull/7822

CMake: 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

cmake: with OpenSSL, define OPENSSL_SUPPRESS_DEPRECATED

To avoid the "... is deprecated" warnings brought by OpenSSL v3.
(We need to address the underlying code at some point of course.)

cmake: with OpenSSL, define OPENSSL_SUPPRESS_DEPRECATED

To avoid the "... is deprecated" warnings brought by OpenSSL v3.
(We need to address the underlying code at some point of course.)

Assisted-by: Jakub Zakrzewski
Closes #7767

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cmake: sync CURL_DISABLE options

Adds the full listing of CURL_DISABLE options to the CMake build. Moves
all option code, except for CURL_DISABLE_OPENSSL_AUTO_LOA_CONFIG which
reside

cmake: sync CURL_DISABLE options

Adds the full listing of CURL_DISABLE options to the CMake build. Moves
all option code, except for CURL_DISABLE_OPENSSL_AUTO_LOA_CONFIG which
resides near OpenSSL configuration, to the same block of code. Also
sorts the options here and in the cmake config header.

Additionally sorted the CURL-DISABLE listing and fixed the
CURL_DISABLE_POP3 option.

Closes #7624

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curl_setup.h: sync values for HTTP_ONLY

The values for HTTP_ONLY differed between CMakeLists.txt and
curl_setup.h. Sync them and sort the values in curl_setup.h to make it
easier to

curl_setup.h: sync values for HTTP_ONLY

The values for HTTP_ONLY differed between CMakeLists.txt and
curl_setup.h. Sync them and sort the values in curl_setup.h to make it
easier to spot differences.

Closes #7601

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cmake: remove libssh2 feature checks

libssh2 features are detected based on version since commit
9dbbba997608f7c3c5de1c627c77c8cd2aa85b73

Closes #7343

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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hostip: (macOS) free returned memory of SCDynamicStoreCopyProxies

From Apples documentation on SCDynamicStoreCopyProxies, "Return Value: A
dictionary of key-value pairs that represent th

hostip: (macOS) free returned memory of SCDynamicStoreCopyProxies

From Apples documentation on SCDynamicStoreCopyProxies, "Return Value: A
dictionary of key-value pairs that represent the current internet proxy
settings, or NULL if no proxy settings have been defined or if an error
occurred. You must release the returned value."

Failure to release the returned value of SCDynamicStoreCopyProxies can
result in a memory leak.

Source: https://developer.apple.com/documentation/systemconfiguration/1517088-scdynamicstorecopyproxies

Closes #7265

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configure/cmake: remove checks for unused gethostbyaddr and gethostbyaddr_r

Closes #7276

configure/cmake: remove checks for unused inet_ntoa and inet_ntoa_r

Closes #7276

configure/cmake: remove unused define HAVE_PERROR

Closes #7276

configure/cmake: remove unused define HAVE_FREEIFADDRS

Closes #7276

configure/cmake: remove unused define HAVE_FORK

Closes #7276

configure/cmake: remove checks for unused sgtty.h

Closes #7276

configure/cmake: remove remaining checks for rsa.h

Closes #7276

configure/cmake: remove remaining checks for err.h

Closes #7276