[FEAT] support ffmpeg hardware decoding on WSL2

[ghost]

Is this a new feature request?

• [X] I have searched the existing issues

Wanted change

support ffmpeg hardware decoding on WSL2

Reason for change

https://www.phoronix.com/news/FFmpeg-VA-API-Windows

Proposed code change

https://github.com/FFmpeg/FFmpeg/commit/a9a2ddaea8318cec43ca916b6b8350f0cf14411d

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[j0nnymoe]

We use the ffmpeg provided by jellyfin directly, probably best to suggest it to them.