* modules/codec/ffmpeg/*: modified the ffmpeg video codec to use direct
   rendering when possible.
   Use BITMAPINFOHEADER from include/codecs.h + got rid of Little Endian
   translations that were already done in the demux.
* modules/demux/avi/* modules/demux/asf/*: Use BITMAPINFOHEADER from
   include/codecs.h.