meson: Enable some MSVC warnings for parity with GCC/Clang

Merged Nirbheek Chauhan requested to merge nirbheek/gst-omx:enable-msvc-warnings-gcc-omx into master

This makes it easier to do development with MSVC by making it warn on common issues that GCC/Clang error out for in our CI configuration.

Continuation from gst-build!223 (merged)

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