Update x264 presets in line with latest x264 changes.
Patch by Lou Logan.
Originally committed as revision 22714 to svn://svn.ffmpeg.org/ffmpeg/trunk
Add presets for all of the x264 presets, including fastfirstpass versions.Not 100% accurate, since not all x264 options have ffmpeg equivalents yet.
Originally committed as revision 22144 to svn://svn.ffmpeg.org/ffmpeg/trunk