Mitigate FindPkgConfig.cmake framework handling bug

[dg0yt]

Fix frameworks incorrectly appearing in link options on repeated CMake configuration runs. The problem doesn't show when building ports (a single CMake run) but in user projects.
The ultimate fix must be in CMake, but vcpkg users are affected now. A CMake version check can be added in the future.

Resolves #35859.
Resolves #35137.

This change doesn't affect ABI hashes / binary caching. i.e. no world rebuild in CI, unless such a build is triggered in another way.

Upstream MR: https://gitlab.kitware.com/cmake/cmake/-/merge_requests/9109

[dg0yt]

The fixup may need to consider that Kitware doesn't really want these variables to be cache variables.
https://gitlab.kitware.com/cmake/cmake/-/merge_requests/9109#note_1464882

[dg0yt]

Upstream accepts pushing the local variables to the cache for now, and this is what this PR implements for currently used releases of CMake.

[JavierMatosD]

@dg0yt, Since this issue impacts macOS users, we recommend addressing it directly with Homebrew rather than backporting the fix here.

Our understanding is that this bug has been resolved in CMake version 3.29, which is yet to be officially released. In the meantime, for those who need an immediate solution, you can access the nightly builds of CMake through this link. These builds should include the fix, and you can use them until Homebrew updates their repository to include CMake 3.29.