This patch is to upgrade gst-ffmpeg to 0.10.13.
Some license files are changed because the folder "ffmpeg" disappears, and those license files under "libav" are the same. LICENSE is different because the word "ffmpeg" is changed into "libav" under the libav folder.
Again, gst-ffmpeg tar ball contains library libav itself. So the configure needs to disable yasm for x86.
