cmake: detect GNU GSS

Fix to set `HAVE_GSSGNU` when GNU GSS is detected.

Also set the appropriate `pkg-config` dependency and do version
detection for the GNU GSS flavour.

cmake: detect GNU GSS

Fix to set `HAVE_GSSGNU` when GNU GSS is detected.

Also set the appropriate `pkg-config` dependency and do version
detection for the GNU GSS flavour.

Tested with `pkg-config` and partly tested without. The latter case
picks up everything else but, in my env. This is likely not the last
word to implement this detection correctly for all build-cases.

GNU GSS doesn't seem to have a Homebrew formula and building
it locally needs manual tweaks to make finish successfully.

Also move a MIT-specific header detection into to MIT-specific `if`
branch.

Closes #15176

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CURLOPT_APPEND.md: goes for SFTP as well

Closes #15181

conncache: find bundle again in case it is removed

When the pool is cleaned up due to host limits, the bundle may be
cleaned up as well making the old pointer invalid.

Fixes #15

conncache: find bundle again in case it is removed

When the pool is cleaned up due to host limits, the bundle may be
cleaned up as well making the old pointer invalid.

Fixes #15185
Reported-by: Moritz Knüsel
Closes #15186

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test1915: remove wrong comment

setopt: use a single function for HTTPAUTH and PROXYAUTH

Avoid duplicated almost-the-same code.

Closes #15182

cmake: do not propagate unused `HAVE_GSSAPI_GSSAPI_KRB5_H` to C

Closes #15174

cmake: detect `HAVE_NETINET_IN6_H`, `HAVE_CLOSESOCKET_CAMEL`, `HAVE_PROTO_BSDSOCKET_H`

To sync with `./configure`.

- `HAVE_NETINET_IN6_H` is
needed by HPE NonStop NSE and NSX

cmake: detect `HAVE_NETINET_IN6_H`, `HAVE_CLOSESOCKET_CAMEL`, `HAVE_PROTO_BSDSOCKET_H`

To sync with `./configure`.

- `HAVE_NETINET_IN6_H` is
needed by HPE NonStop NSE and NSX systems.
Follow-up to 76ebd54175bad02b29769d797adf72fdf3df119f #2155

- `HAVE_CLOSESOCKET_CAMEL`, `HAVE_PROTO_BSDSOCKET_H`
are for AmigaOS.
(Note: `./configure` tries to detect these for all targets, cmake does
it only for AmigaOS, to not inflate configure time.)

Closes #15172

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configure: drop unused bare `socket.h` detection

Added in 37eba37019388f767f5de67b4071641044d7b026 (2009-06-17) to help
detecting socket functions.

But, this `socket.h` isn't us

configure: drop unused bare `socket.h` detection

Added in 37eba37019388f767f5de67b4071641044d7b026 (2009-06-17) to help
detecting socket functions.

But, this `socket.h` isn't used in the source code since
90dd1fc66401d5bb7814f4edeb16a06c925b1f1e #8288 (2022-01-16).

Closes #15173

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sws: fix unused static function with `TCP_NODELAY` undefined

Closes #15171

configure: drop duplicate feature checks for `poll()`, `if_nametoindex()`

Before this patch they were detected via manual methods, then with
`AC_CHECK_FUNCS()`.

Delete the manua

configure: drop duplicate feature checks for `poll()`, `if_nametoindex()`

Before this patch they were detected via manual methods, then with
`AC_CHECK_FUNCS()`.

Delete the manual checks and keep the latter.

Also delete `CURL_INCLUDES_POLL()` which is no longer used after
the above.

Closes #15170

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build: detect and use `_setmode()` with Cygwin/MSYS, also use on Windows

Before this patch `setmode()` was not detected with Cygwin/MSYS, because
it's a macro, not a function, and detect

build: detect and use `_setmode()` with Cygwin/MSYS, also use on Windows

Before this patch `setmode()` was not detected with Cygwin/MSYS, because
it's a macro, not a function, and detection is looking for a function.

Switching to symbol detection doesn't work because it mis-detects it on
BSD systems which features a function with the same name but different
functionality and arguments.

Fix it by looking for a `_setmode()` function on Cygwin/MSYS, and use it
if available.

`_setmode()` is recommended over `setmode()` by Windows documentation so
use that on Windows too. It seems to be available on all supported
compilers, so omit detection.

https://learn.microsoft.com/cpp/c-runtime-library/reference/posix-setmode
https://learn.microsoft.com/cpp/c-runtime-library/reference/setmode

Officially Windows requires argument `_O_BINARY` with an underscore.
`O_BINARY` is also supported but bound to conditions. Continue to use it
for simplicity. Cygwin supports `O_BINARY` (no underscore).

Closes #15169

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ech: spelling, whitespace, say `--ech` default config

Closes #15167

GHA/macos: comment spelling and clarity

Closes #15166

build: add `ldap` to `libcurl.pc` `Requires:`

Closes #15163

RELEASE-NOTES: synced

INSTALL-CMAKE.md: mention focus on shared libraries

Match what the INSTALL.md document says for configure builds.

Reported-by: Nemos2024 on github
Fixes #14845
Closes #15168

ci: update dependency ngtcp2/nghttp3 to v1.6.0

Closes #15161

ci: update dependency ngtcp2/ngtcp2 to v1.8.0

Closes #15162

GHA/non-native: fix OmniOS job to fail on tests

Before this patch a failed test did not result in a failed CI job.

Closes #15160

cmake: use OpenSSL for LDAP detection only if available

Also unset `CMAKE_REQUIRED_LIBRARIES` in two error branches.

Reported-by: Vollstrecker on github
Fixes #15077
Closes

cmake: use OpenSSL for LDAP detection only if available

Also unset `CMAKE_REQUIRED_LIBRARIES` in two error branches.

Reported-by: Vollstrecker on github
Fixes #15077
Closes #15152

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warnless: remove curlx_sktosi and curlx_sitosk

They were only used by test server code. Use plain old typecasts there.

Closes #15153

tests: enable additional ruff Python lint options

These all seem reasonable to enable for this code.

CI: run pytype and ruff on Python code

These ensure a more consistent style and can find some errors statically
that would otherwise only be seen at run-time. Also, bump the Ubuntu
v

CI: run pytype and ruff on Python code

These ensure a more consistent style and can find some errors statically
that would otherwise only be seen at run-time. Also, bump the Ubuntu
version of some other checks to get newer versions of some linters.

Closes #15067

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tests: change Python code style to pass ruff checks

Most of the changes consisted of removing unused imports and unnecessary
f-strings.

tests: fix some Python typing issues

These otherwise raise errors in pytype. A few problematic methods
weren't being used and are deleted.