[mpv/f31] (5 commits) ...Enable vapoursynth (rfbz#5681)

Summary of changes: bf6ab8d... clean up (*) 48b25a1... Rebuild for new libplacebo version (*) 60f14c3... - Rebuild for ffmpeg-4.3 git (*) ccaa149... Rebuild for new libcdio version (*) 6205ad0... Enable vapoursynth (rfbz#5681) (*) (*) This commit already existed in another branch; no separate mail sent