real demux: Set to prio 0.

Our real demux is incomplete and crashes avcodec. The avformat demux works, so i say we use it until someone fixes this thing.

modules/demux/real.c

@@ -66,7 +66,7 @@ static void Close  ( vlc_object_t * );
 
 vlc_module_begin();
     set_description( N_("Real demuxer" ) );
-    set_capability( "demux", 15 );
+    set_capability( "demux", 0 );
     set_category( CAT_INPUT );
     set_subcategory( SUBCAT_INPUT_DEMUX );
     set_callbacks( Open, Close );