[openh264] Update to version 2.5.0

[tartanpaint]

• Changes comply with the maintainer guide.
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• The "supports" clause reflects platforms that may be fixed by this new version.
• Any fixed CI baseline entries are removed from that file.
• Any patches that are no longer applied are deleted from the port's directory.
• The version database is fixed by rerunning ./vcpkg x-add-version --all and committing the result.
• Only one version is added to each modified port's versions file.

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[Cheney-W]

CI failure logs: https://dev.azure.com/vcpkg/public/_build/results?buildId=110735&view=artifacts&pathAsName=false&type=publishedArtifacts

ffmpeg install failed with below error:
ERROR: openh264 >= 1.3.0 not found using pkg-config

[dg0yt]

The pc files must forward actual C++ link libraries. There is no example how to do that with meson, and I didn't want to add untested review comments. Together with other useful improvements, I took this PR as the base for #42966. Now waiting for CI.