Revert previous removal of PAM, PBM, PGM, PGMYUV and PPM from the list of supported image formats. Apparently decoding these formats is supported.
Revert previous removal of PAM, PBM, PGM, PGMYUV and PPM from the list of
supported image formats. Apparently decoding these formats is supported.


git-svn-id: a4d7c1866f8397a4106e0b57fc4fbf792bbdaaaf@17722 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

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