Fixes for using FFmpeg 6.1 due to deprecations. Uses `#if` macros to
allow builds for using older versions of FFmpeg.
The change in deps/media-playback/media-playback/decode.c is due to
FFmpeg moving "side_data" into AVCodecParameters which is mentioned in
commit [1] in FFmpeg's repository.
In summary of the "side_data" change, AVStream.side_data is deprecated
and replaced with AVStream.codecpar->coded_side_data, and
AVStream.nb_side_data is replaced with
AVStream.codecpar->nb_coded_side_data.
[1]: avcodec/codec_par: add side data to AVCodecParameters
21d7cc6fa9
4b5be75c7e