* reimplemented remaing avg_ pixel functions * modified PAVGB mmx macro to select mmx register with FE constant
* reimplemented remaing avg_ pixel functions
* modified PAVGB mmx macro to select mmx register with FE constant


git-svn-id: a4d7c1866f8397a4106e0b57fc4fbf792bbdaaaf@657 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

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