remove incorrect useage of av_free_static(), ffmpeg.c is not a windows dll which can be unloaded and loaded again.
remove incorrect useage of av_free_static(), ffmpeg.c is not a
windows dll which can be unloaded and loaded again.


git-svn-id: a4d7c1866f8397a4106e0b57fc4fbf792bbdaaaf@13565 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

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