Convert RoQ decoder to use YUV 4:4:4 unpacked macroblocks

instead of packed 4:2:0 clusters
patch by Eric Lasota: \ riot icculus org /
original threads: [FFmpeg-devel]   [PATCH] RoQ decoder 4:4:4 update
date: 06/04/2007 03:52 AM and 06/05/2007 01:10 AM

Originally committed as revision 9223 to svn://svn.ffmpeg.org/ffmpeg/trunk