h264_idct_add_altivec, based on an old patch from Mauricio Alvarez <alvarezATac.upc.edu>, polished by David Conrad <umovimusATgmail.com>
h264_idct_add_altivec, based on an old patch from Mauricio Alvarez <alvarezATac.upc.edu>, polished by David Conrad <umovimusATgmail.com>

git-svn-id: a4d7c1866f8397a4106e0b57fc4fbf792bbdaaaf@9182 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

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