For example, we build ffmpeg with --disable-sse, which seems like a wasted opportunity.
This task involves going over libraries in build_files/build_environment/cmake/ and verifying that:
- SSE and SSE2 are enabled, since those are always supported by x86-64.
- Check if SSE3/SSE4/AVX/AVX2 can be enabled, for libraries that can detect CPU capabilities and use them only when supported.
- Check if multithreading is enabled where possible.
- Test that the functionality still works correctly.