fb3c4715cd Ninja: Restore detection of msvc-wine showIncludes prefix

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: huangqinjin <huangqinjin@gmail.com>
Merge-request: !8479

Since commit 8f82e755f3 (Ninja: Fix detection of MSVC showIncludes
prefix in Italian, 2023-01-26, v3.26.0-rc1~20^2) our regex no longer
matches the output from `msvc-wine`, which uses forward slashes:

    Note: including file: /path/to/foo.h

`cl /showIncludes` under Wine prints paths of the form `Z:\path\to\file`,
but the `msvc-wine` wrapper converts them to the form `/path/to/file` so
that native Ninja can be used.  Update our regex to match the prefix
followed by a path with a leading forward slash.

Fixes: #24908

843fc607de Ninja: Restore detection of clang-cl showIncludes prefix
3346570ae9 Tests: Comment RunCMake.Ninja ShowIncludes sample input languages

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !8344

Since commit 8f82e755f3 (Ninja: Fix detection of MSVC showIncludes
prefix in Italian, 2023-01-26, v3.26.0-rc1~20^2) our regex no longer
matches the output from `clang-cl`, which uses a relative path, forward
slashes, and is always in English [1]:

    Note: including file: ./foo.h

Update the regex to match that too.

[1] https://github.com/llvm/llvm-project/blob/llvmorg-16.0.0/clang/lib/Frontend/HeaderIncludeGen.cpp#L102

Co-authored-by: Brad King <brad.king@kitware.com>

Add CMake variable `CMAKE_ADD_CUSTOM_COMMAND_DEPENDS_EXPLICIT_ONLY` to enable
option `DEPENDS_EXPLICIT_ONLY` on all uses of `add_custom_command`.

Fixes: #17097

082ccd7530 add_custom_command: Add DEPENDS_EXPLICIT_ONLY option for Ninja

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !8198

Add option `DEPENDS_EXPLICIT_ONLY` to `add_custom_command` to indicate
that implicit dependencies coming from users of the output are not
needed, and only consider dependencies explicitly specified in the
custom command.

Fixes: #17097

Issue a deprecation warning on calls to `cmake_minimum_required` or
`cmake_policy` that set policies based on versions older than 3.5.
Note that the effective policy version includes `...<max>` treatment.
Update the check from commit 5845c218d7 (Deprecate compatibility with
CMake versions older than 2.8.12, 2020-06-12, v3.19.0-rc1~629^2).

For policy-specific tests, use the version before the policy was
introduced.  Otherwise, use 3.5 where possible.

Also, remove `cmake_minimum_required()` and `project()` calls from
individual cases where they are handled by `CMakeLists.txt`.

The prefix does not have two colons.  Update our regex.

Fixes: #24357