[theora] libavcodec vp3 / theora decoder speedup

[Stefan Gürtler]

The vp3 / theora decoder in FFmpeg project received a major speedup:

http://multimedia.cx/eggs/profiling-and-optimizing-theora/#comment-150751

http://git.ffmpeg.org/?p=ffmpeg;a=commit;h=6e8061980c9a18a0eb9802f5dc5becc349066680
http://git.ffmpeg.org/?p=ffmpeg;a=commit;h=8476744ba50d26a3e188def192cd9086b0f781d7
http://git.ffmpeg.org/?p=ffmpeg;a=commit;h=a51faef9b61bd80499a28322802ef4b22be44d43

Lets hope that it still produces accurate pictures for all supported 
colour schemas.

Yours
Stefan