removed os_support.h as most of libavcodec is os independant - most of the time only libavformat needs OS dependant features
removed os_support.h as most of libavcodec is os independant - most of the time only libavformat needs OS dependant features


git-svn-id: a4d7c1866f8397a4106e0b57fc4fbf792bbdaaaf@2226 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

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