With new option `CURL_DISABLE_SRP=ON` to force-disable it.

Also:
- fix detecting GnuTLS.
- comment typos, whitespace.

Ref: curl#11964

Closes #xxxxx

With new option `CURL_DISABLE_SRP=ON` to force-disable it.
To match existing similar option and detection logic in autotools.

Also:
- fix detecting GnuTLS.
- comment typos, whitespace.

Ref: curl#11964

Closes #xxxxx

With new option `CURL_DISABLE_SRP=ON` to force-disable it.
To match existing similar option and detection logic in autotools.

Also:
- fix detecting GnuTLS.
- comment typos, whitespace.

Ref: curl#11964

Closes #xxxxx

With new option `CURL_DISABLE_SRP=ON` to force-disable it.
To match existing option and detection logic in autotools.

Also:
- fix detecting GnuTLS.
  We assume `nettle` as a GnuTLS dependency.
- add CMake GnuTLS CI job.
- bump AppVeyor CMake OpenSSL MSVC job to OpenSSL 1.1.1 (from 1.0.2)
  TLS-SRP fails to detect with 1.0.2 due to an OpenSSL header bug.
- fix compiler warning when building with GnuTLS and disabled TLS-SRP.
- fix comment typos, whitespace.

Ref: #11964

Closes #11967

- for sys/uio.h
- for fork
- for connect

Ref: #11964

- check for arc4random. To make rand.c use it accordingly.
- check for fcntl
- fix fseek detection
- add SIZEOF_CURL_SOCKET_T
- fix USE_UNIX_SOCKETS
- define HAVE_SNPRINTF to 1
- check for fnmatch
- check for sched_yield
- remove HAVE_GETPPID duplicate from curl_config.h
- add HAVE_SENDMSG

Ref: #11964

It is not used in any code anywhere.

Ref: #11964

And fix the HAVE_LONGLONG define

Ref: #11964

And fix the HAVE_LONGLONG define

Ref: #11964
Closes #11977

It is not used in any code anywhere.

Ref: #11964
Closes #11975

- for sys/uio.h
- for fork
- for connect

Ref: #11964

Closes #11973

- check for arc4random. To make rand.c use it accordingly.
- check for fcntl
- fix fseek detection
- add SIZEOF_CURL_SOCKET_T
- fix USE_UNIX_SOCKETS
- define HAVE_SNPRINTF to 1
- check for fnmatch
- check for sched_yield
- remove HAVE_GETPPID duplicate from curl_config.h
- add HAVE_SENDMSG

Ref: #11964

Co-authored-by: Viktor Szakats
Closes #11973

Move detection before the creation of detection results
in `curl_config.h`.

Ref: curl#11964

Closes #xxxxx

Move detection before the creation of detection results
in `curl_config.h`.

Ref: curl#11964

Closes #xxxxx

This restores `CURL_CHECK_FUNC_IOCTL` detection. I deleted it in
4d73854 and
c345665 (2022-08), because the
`HAVE_IOCTL` result it generated was unused in the source. But,
I did miss the fact that this had two dependent checks:
`CURL_CHECK_FUNC_IOCTL_FIONBIO`,
`CURL_CHECK_FUNC_IOCTL_SIOCGIFADDR` that we do actually need:
`HAVE_IOCTL_FIONBIO`, `HAVE_IOCTL_SIOCGIFADDR`.

Regression from 4d73854

Ref: #11964 (effort to sync cmake detections with autotools)

Closes #12008

- set `HAVE_LDAP_URL_PARSE` if `ldap_url_parse` function exists.
  Before this patch we set it based it on the presence of `stricmp`,
  which correctly enabled it on e.g. Windows, but was inaccurate for
  other platforms.

- always set `HAVE_LDAP_SSL` if an LDAP backend is detected and
  LDAPS is not explicitly disabled. This mimics autotools behaviour.
  Previously we set it only for Windows LDAP. After this fix, LDAPS is
  correctly enabled in default macOS builds.

- enable LDAP[S] for a CMake macOS CI job. Target OS X 10.9 (Mavericks)
  to avoid deprecation warnings for LDAP API.

- always detect `HAVE_LDAP_SSL_H`, even with LDAPS explicitly disabled.
  This doesn't make much sense, but let's do it to sync behaviour with
  autotools.

- fix benign typo in variable name.

Ref: #11964 (effort to sync cmake detections with autotools)

Closes #12006

Left there by accident after adding proper detection for this.

Follow-up to 772f0d8 #12006

Ref: #11964 (effort to sync cmake detections with autotools)

Closes #12015

Follow-up to 2e0fa50 #11964
Follow-up to c39585d #12000

Closes #12023

- cmake: detect OpenLDAP based on function `ldap_init_fd`.
  autotools does this. autotools also publishes this detection result
  in `HAVE_LDAP_INIT_FD`. We don't mimic that with CMake as the source
  doesn't use this value. (it might need to be remove-listed in
  `scripts/cmp-config.pl` for future OpenLDAP test builds.)
  This also deletes existing self-declaration method via the
  CMake-specific `CURL_USE_OPENLDAP` configuration.

- cmake: define `LDAP_DEPRECATED=1` for OpenLDAP.
  Like autotools does. This fixes a long list of these warnings:
  ```
  /usr/local/opt/openldap/include/ldap.h:1049:5: warning: 'LDAP_DEPRECATED' is not defined, evaluates to 0 [-Wundef]
  ```

- cmake: delete LDAP TODO comment no longer relevant.

Also:

- autotools: replace domain name `dummy` with `0.0.0.0` in LDAP feature
  detection functions.

Ref: #11964 (effort to sync cmake detections with autotools)

Closes #12024

Syncing this up with CMake.

Source code uses the built-in `OPENSSL_IS_AWSLC` and
`OPENSSL_IS_BORINSSL` macros to detect BoringSSL and AWS-LC. No help
is necessary from the build tools.

autotools detects this anyway for display purposes.
CMake detects this to decide whether to use the BoringSSL-specific
crypto lib with ngtcp2. It detects AWS-LC, but doesn't use the
detection results just yet.

Ref: curl#11964

Closes #xxxxx

Syncing this up with CMake.

Source code uses the built-in `OPENSSL_IS_AWSLC` and
`OPENSSL_IS_BORINSSL` macros to detect BoringSSL and AWS-LC. No help is
necessary from the build tools.

The one use of `HAVE_BORINGSSL` in the source turned out to be no longer
necessary for warning-free BoringSSL + Schannel builds. Ref: #1610 #2634

autotools detects this anyway for display purposes.
CMake detects this to decide whether to use the BoringSSL-specific
crypto lib with ngtcp2. It detects AWS-LC, but doesn't use the detection
result just yet (planned in #12066).

Ref: #11964

Reviewed-by: Daniel Stenberg
Reviewed-by: Jay Satiro
Closes #12065

Fix `HAVE_H_ERRNO_ASSIGNABLE` to not run, only compile its test snippet,
aligning this with autotools. This fixes an error when doing
cross-builds and also actually detects this feature. It affected systems
not allowlisted into this, e.g. SerenityOS.

We used this detection result to enable `HAVE_GETADDRINFO_THREADSAFE`.

Follow-up to 04a3a37 #11979
Ref: #12095 (closed in favour of this patch)
Ref: #11964 (effort to sync cmake detections with autotools)

Reported-by: Kartatz on Github
Assisted-by: Kartatz on Github
Fixes #12093
Closes #12094