config: rename the OS define to CURL_OS to reduce collision risk

Reported-by: Jon Rumsey
Fixes #15455
Closes #15457

cmake: do not propagate unused `HAVE_GSSAPI_GSSAPI_KRB5_H` to C

Closes #15174

cmake: delete unused `NEED_LBER_H`, `HAVE_LDAP_H`

Both are used by `./configure` internally, not by curl C code.
CMake adds `NEED_LBER_H` to `CURL_TEST_DEFINES`, which is used by
`cu

cmake: delete unused `NEED_LBER_H`, `HAVE_LDAP_H`

Both are used by `./configure` internally, not by curl C code.
CMake adds `NEED_LBER_H` to `CURL_TEST_DEFINES`, which is used by
`curl_internal_test()`, but there is no LDAP-related test made with that
call.

Thus, stop detecting and publishing these from CMake.

`NEED_LBER_H` added in 7320e53d9e17b22cacea77a89ecaa8348513f0e1.
`HAVE_LDAP_H` added in 4c5307b45655ba75ab066564afdc0c111a8b9291 (initial CMake commit).

Closes #14690

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GHA/configure-vs-cmake: add Windows build, fix issues

- configure: disable pthreads by default on Windows.
- configure: disable detecting `fseeko()` on Windows.
(It exists in mingw

GHA/configure-vs-cmake: add Windows build, fix issues

- configure: disable pthreads by default on Windows.
- configure: disable detecting `fseeko()` on Windows.
(It exists in mingw-w64 2.0.0 and newer, but it's permanently ignored
in CMake, as this function is never necessary on Windows.)
- extend existing exceptions with their Windows variants.
- `lib/formdata.c`: prioritize `_fseeki64()` over `fseeko()`.
To reduce the difference between Windows builds, which now all use
`_fseeki64()`.
- cmake: perm-enable `HAVE_DIRENT_H` and `HAVE_OPENDIR` for mingw-w64,
to match configure.
Follow-up to bfe54b0e88239da542493321e795cd71c14af9cc #13137
This in theory could make the dir listing feature work in mingw-w64
build, but in my tests (on WINE) it failed at the preceding `open()`
call.
- cmake: perm-enable `HAVE_STRINGS_H` and `HAVE_UTIME_H` for mingw-w64,
to match configure. (They are wrappers and make no difference in the build.)

Also:
- configure: sync `USE_MANUAL` macro with cmake, by only setting it for
`src`. Drop checker exception.
- CI: use `--disable-dependency-tracking` in existing jobs.
- CI: install packages before git checkout, in existing jobs.

Closes #14678

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configure: delete unused `HAVE_OPENSSL3` macro

Closes #14672

GHA/configure-vs-cmake: add macOS build, fix issues

- sync cmake macOS `OS` value manually with the autotools one.
- stop exporting/subst-ing `HAVE_OPENSSL_QUIC` from autotools.
Th

GHA/configure-vs-cmake: add macOS build, fix issues

- sync cmake macOS `OS` value manually with the autotools one.
- stop exporting/subst-ing `HAVE_OPENSSL_QUIC` from autotools.
The variable was only used internally.
- exclude a dependency detection symbol.
- allow to run when the workflow itself was updated.
- simplify cmake command.
- fix indentation.

Closes #14546

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dist: add CI job to detect files missing from distro

Also:
- delete previous, cmake-specific solution.
- move a CI script under `.github`.

Follow-up to a118a6ecddb0322a6da07

dist: add CI job to detect files missing from distro

Also:
- delete previous, cmake-specific solution.
- move a CI script under `.github`.

Follow-up to a118a6ecddb0322a6da07815aabf9e36cd5f44bc #14323
Closes #14463

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