Rename xvmc flags to follow ffmpeg AV_ notion. preserve MP_ ones until next major bump.
Rename xvmc flags to follow ffmpeg AV_ notion.
preserve MP_ ones until next major bump.


git-svn-id: a4d7c1866f8397a4106e0b57fc4fbf792bbdaaaf@17245 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

prajnashi/ffmpeg,prajnashi/ffmpeg,prajnashi/ffmpeg,prajnashi/ffmpeg