Make Matroska demuxer output full frames instead of slices for RealVideo

Patch by Aurelien Jacobs (aurel at "... is not unix"age.org)
Thread [RFC] Feed whole frames to RV* decoders

Originally committed as revision 10824 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/matroska.h

@@ -169,7 +169,6 @@ typedef enum {
   MATROSKA_TRACK_ENABLED = (1<<0),
   MATROSKA_TRACK_DEFAULT = (1<<1),
   MATROSKA_TRACK_LACING  = (1<<2),
-  MATROSKA_TRACK_REAL_V  = (1<<4),
   MATROSKA_TRACK_SHIFT   = (1<<16)
 } MatroskaTrackFlags;