disabling compilation of .so if its not needed, gcc 3.1 seems to have problems with it
disabling compilation of .so if its not needed, gcc 3.1 seems to have problems with it


git-svn-id: a4d7c1866f8397a4106e0b57fc4fbf792bbdaaaf@1125 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

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