build: delete unused feature guards

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

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

copyright: fix missing year (range) updates

cmake: expose CURL_DISABLE_OPENSSL_AUTO_LOAD_CONFIG

This does for cmake builds what --disable-openssl-auto-load-config
does for autoconf builds.

Closes https://github.com/curl/c

cmake: expose CURL_DISABLE_OPENSSL_AUTO_LOAD_CONFIG

This does for cmake builds what --disable-openssl-auto-load-config
does for autoconf builds.

Closes https://github.com/curl/curl/pull/6435

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cmake: check for linux/tcp.h

The HAVE_LINUX_TCP_H define was not set by cmake.

Closes #6252

curl.se: new home

Closes #6172

alt-svc: enable by default

Remove CURLALTSVC_IMMEDIATELY, which was never implemented/supported.

alt-svc support in curl is no longer considered experimental

Closes #5868

CMake: store IDN2 information in curl_config.h

This allows the build to enable IDN properly and it makes test 1014
happier.

Ref: #6074
Closes #6108

mqtt: enable by default

No longer considered experimental.

Closes #5858

content_encoding: add zstd decoding support

include zstd curl patch for Makefile.m32 from vszakats
and include Add CMake support for zstd from Peter Wu

Helped-by: Viktor Szakats

content_encoding: add zstd decoding support

include zstd curl patch for Makefile.m32 from vszakats
and include Add CMake support for zstd from Peter Wu

Helped-by: Viktor Szakats
Helped-by: Peter Wu
Closes #5453

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CMake: add libssh build support

Closes #5372

CMake: add ENABLE_ALT_SVC option

Tested alt-svc with quiche. While at it, add missing MultiSSL reporting
(not tested).

CMake: add HTTP/3 support (ngtcp2+nghttp3, quiche)

Add three new CMake Find modules (using the curl license, but I grant
others the right to apply the CMake BSD license instead).

CMake: add HTTP/3 support (ngtcp2+nghttp3, quiche)

Add three new CMake Find modules (using the curl license, but I grant
others the right to apply the CMake BSD license instead).

This CMake config is simpler than the autotools one because it assumes
ngtcp2 and nghttp3 to be used together. Another difference is that this
CMake config checks whether QUIC is actually supported by the TLS
library (patched OpenSSL or boringssl) since this can be a common
configuration mistake that could result in build errors later.

Unlike autotools, CMake does not warn you that the features are
experimental. The user is supposed to already know that and read the
documentation. It requires a very special build environment anyway.

Tested with ngtcp2+OpenSSL+nghttp3 and quiche+boringssl, both built from
current git master. Use `LD_DEBUG=files src/curl |& grep need` to figure
out which features (libldap-2.4, libssh2) to disable due to conflicts
with boringssl.

Closes #5359

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mqtt: add new experimental protocol

Closes #5173

config: remove all defines of HAVE_DES_H

As there's no code using it.

Closes #5144

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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cmake: add support for building with wolfSSL

My working build cmdline:

$ cmake -DCMAKE_PREFIX_PATH=$HOME/build-wolfssl -DCMAKE_USE_WOLFSSL=ON .

Assisted-by: Brad King
C

cmake: add support for building with wolfSSL

My working build cmdline:

$ cmake -DCMAKE_PREFIX_PATH=$HOME/build-wolfssl -DCMAKE_USE_WOLFSSL=ON .

Assisted-by: Brad King
Closes #5095

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build: remove all HAVE_OPENSSL_ENGINE_H defines

... as there's nothing in the code that actually uses the define! The
last reference was removed in 38203f158.

Closes #5007

polarssl: Additional removal

Follow up to 6357a19f.

Reviewed-by: Daniel Stenberg
Closes #5004

cmake: Enable SMB for Windows builds

- Define USE_WIN32_CRYPTO by default. This enables SMB.

- Show whether SMB is enabled in the "Enabled features" output.

- Fix mingw com

cmake: Enable SMB for Windows builds

- Define USE_WIN32_CRYPTO by default. This enables SMB.

- Show whether SMB is enabled in the "Enabled features" output.

- Fix mingw compiler warning for call to CryptHashData by casting away
const param. mingw CryptHashData prototype is wrong.

Closes https://github.com/curl/curl/pull/4717

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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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CMake: add support for building with the NSS vtls backend

Options are cross-checked with configure.ac and acinclude.m4.
Tested on Arch Linux, untested on other platforms like Windows or

CMake: add support for building with the NSS vtls backend

Options are cross-checked with configure.ac and acinclude.m4.
Tested on Arch Linux, untested on other platforms like Windows or macOS.

Closes #4663
Reviewed-by: Kamil Dudka

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TLS: add BearSSL vtls implementation

Closes #4597

build: Remove unused HAVE_LIBSSL and HAVE_LIBCRYPTO defines

Closes https://github.com/curl/curl/pull/4460

openssl: define HAVE_SSL_GET_SHUTDOWN based on version number

Closes #4100

cmake: support CMAKE_OSX_ARCHITECTURES when detecting SIZEOF variables

Closes #3945