build: fix clang-cl builds, add CI job

- appveyor: add build-only job for clang-cl.

- cmake: `-pedantic-errors` enables `-Werror,-Wlanguage-extension-token`
automatically, whi

build: fix clang-cl builds, add CI job

- appveyor: add build-only job for clang-cl.

- cmake: `-pedantic-errors` enables `-Werror,-Wlanguage-extension-token`
automatically, which makes `__int64` detection fail.
Explictly disable this compiler warning for clang-cl to make the
feature detection work and to accept `__int64` in the source code.

- cmake: disable `-Wlanguage-extension-token` warning for clang-cl
to fix these when encountering `__int64`:
```
lib/formdata.c(797,29): error : extension used [-Werror,-Wlanguage-extension-token]
lib/warnless.c(117,33): error : extension used [-Werror,-Wlanguage-extension-token]
lib/warnless.c(60,28): message : expanded from macro 'CURL_MASK_SCOFFT'
lib/warnless.c(59,38): message : expanded from macro 'CURL_MASK_UCOFFT'
include\curl/system.h(352,40): message : expanded from macro 'CURL_TYPEOF_CURL_OFF_T'
```

- make `__GNUC__` warning suppressions apply to `__clang__` too.
Necessary for clang-cl, which defines the latter, but not the former.
(Regular clang defines both.)

- examples: fix clang-cl compiler warning in `http2-upload.c`.
```
docs\examples\http2-upload.c(56,5): error : no previous prototype for function 'my_gettimeofday' [-Werror,-Wmissing-prototypes]
docs\examples\http2-upload.c(56,1): message : declare 'static' if the function is not intended to be used outside of this translation unit
```

- unit2604: add missing `#pragma GCC diagnostic pop`.
Follow-up to e53523fef07894991c69d907a7c7794c7ada4ff4 #14859

- unit1652: limit compiler warning suppression to GCC.
They do not affect clang builds.
Follow-up to 71cf0d1fca9e1f53524e1545ef0c08d174458d80 #14772

Closes #15449

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lib: move curl_path.[ch] into vssh/

As this contains code only used by SSH backends.

Closes #15284

tests: libtests and unit tests need explicit #include memdebug

... as otherwise they do not monitor the resource use within the test
files - until they are unity built.

Closes #

tests: libtests and unit tests need explicit #include memdebug

... as otherwise they do not monitor the resource use within the test
files - until they are unity built.

Closes #15007

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CI: move Azure jobs to GHA, fix fallouts, sshserver, runtests tweaks

CI:

- GHA/windows: enable OpenSSH server, SysInternals `handle`, `impacket`.
Skip `impacket` on MSYS2 due

CI: move Azure jobs to GHA, fix fallouts, sshserver, runtests tweaks

CI:

- GHA/windows: enable OpenSSH server, SysInternals `handle`, `impacket`.
Skip `impacket` on MSYS2 due to install failure.
Skip OpenSSH server for old/standalone mingw-w64 (building curl
without SSH there.)
- GHA/windows: make test tool installs a separate step.
- GHA/cygwin: enable OpenSSH server.
Skip `impacket`: it's compiling for 7 minutes then breaks.
Skip `stunnel` due to sluggish test run performance.
(This update is unrelated to Azure jobs.)
- GHA/linux: migrate Linux jobs from Azure CI.
- GHA/linux: migrate scanbuild job from Azure CI.
- GHA/linux: enable libssh2 in a job. Also enable valgrind.
- CI/windows: enable SSPI in two jobs.
- CI/windows: disable zlib in one more job.
- CI/windows: improve `if` condition checking GnuTLS.
- CI/windows: ignore SFTP/SCP tests as necessary.
- universally ignore SCP tests, they fail everywhere.
- ignore test 612.
- ignore test 613 616 618 with MSYS2 mingw-w64.
- ignore test 614 with libssh.
- ignore all SFTP with MSYS2 native.
- ignore all SFTP with vcpkg with `libssh2[core,zlib]`.
- ignore a couple of SFTP tests with MSYS2 mingw-w64.
(This matches settings on Azure CI.)
- GHA/windows: ignore failing 1451 'Basic SMB request' test for
old mingw-w64 7.3.0 (but not for 9.5.0!):
```
2024-09-11 21:45:59,738 ERROR smbComNegotiate: b'NT LM 0.12\x00' is not in list
[...]
curl: (7) Could not connect to server
[...]
FAIL 1451: 'Basic SMB request' SMB
```
Ref: https://github.com/curl/curl/actions/runs/10816280746/job/30007130770#step:13:3546
- CI/Azure: delete, now moved to GHA.

sshserver:

- sshserver: fix permissions for SSH host key on Windows, allowing sshd
to launch.
- sshserver: fix initializing config paths with Cygwin/MSYS2 sshd.
- sshserver: fix initializing config paths in parallel builds.
- sshserver: delete redundant `DenyUsers`. This also opens the way
to allow multiple usernames.
- sshserver: fix `AllowUsers` for GHA/windows, by allowing the
domainless username again.
Follow-up to 3ee7c676ec8ef32e3a9cb4d0fb2929a8335d58db #5721
- sshserver: fix `Deprecated option` warnings in `sshd_config`:
```
D:/a/curl/curl/bld/tests/log/2/server/curl_sshd_config line 7: Deprecated option AuthorizedKeysFile2
D:/a/curl/curl/bld/tests/log/2/server/curl_sshd_config line 25: Deprecated option KeyRegenerationInterval
D:/a/curl/curl/bld/tests/log/2/server/curl_sshd_config line 35: Deprecated option RhostsRSAAuthentication
D:/a/curl/curl/bld/tests/log/2/server/curl_sshd_config line 36: Deprecated option RSAAuthentication
D:/a/curl/curl/bld/tests/log/2/server/curl_sshd_config line 37: Deprecated option ServerKeyBits
D:/a/curl/curl/bld/tests/log/2/server/curl_sshd_config line 41: Deprecated option UseLogin
```
- sshserver: fix `Deprecated option` warnings in `ssh_config` with
Cygwin/MSYS2.
- sshserver: fix dumping config files due to the filenames missing their
full paths.
- sshserver: add workaround to make `logmsg` messages visible.
Before this patch they only went to a file and never shown.

runtests:

- runtests: log details when these Windows commands are called:
`handle`, `taskkill`, `tasklist`.
- runtests: add documentation links to Windows tools:
`handle`, `taskkill`, `tasklist`, `icacls`.
- runtests: add `-t` (kill whole tree) option to `taskkill` in
`servers.pm`, syncing it with the other `taskkill` call.
Follow-up to bc72a78a11764558639131d51fa8e7c81ee1e113 #14488
- runtests: show warning if Sysinternals `handle` tool is missing.
- runtests: drop Windows XP Home compatibility `tskill` call.
The call was made on all Windows versions. It's possibly overkill to
do this, because XP Home is probably rarely used for running curl
tests these days. In case it's needed, it'd be better to put it under
an explicit option.
- runtests: show Perl version and path.

Fix/silence fallouts:

- unit2603: fix building with disabled HTTP support.
- unit2604: silence `-Woverlength-strings` warnings in C89 mode.
- test437, test1614: fix to pass with no-IPv6 builds.

Closes #14859

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unit2604: use 'unitfail' instead of 'error' variable

Since the framework is already returning that variable by default.
Avoids a warning for unreachable code.

Reported-by: Tal R

unit2604: use 'unitfail' instead of 'error' variable

Since the framework is already returning that variable by default.
Avoids a warning for unreachable code.

Reported-by: Tal Regev
Fixes #13967
Closes #13973

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tests: make the unit test result type `CURLcode`

Before this patch, the result code was a mixture of `int` and
`CURLcode`.

Also adjust casts and fix a couple of minor issues fou

tests: make the unit test result type `CURLcode`

Before this patch, the result code was a mixture of `int` and
`CURLcode`.

Also adjust casts and fix a couple of minor issues found along the way.

Cherry-picked from #13489
Closes #13600

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unit2604: use alloc instead of overlong string const

Closes #13563

curl_path: make Curl_get_pathname use dynbuf

... instead of malloc and memcpy

- unit test 2604 verifies Curl_get_pathname()

Closes #13550