Fix initialization of vc1_decoder (the same as wmv3_decoder).

Patch by Reimar Doeffinger.

Originally committed as revision 5544 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/h263dec.c

@@ -85,6 +85,7 @@ int ff_h263_decode_init(AVCodecContext *avctx)
         s->h263_pred = 1;
         s->msmpeg4_version=5;
         break;
+    case CODEC_ID_VC1:
     case CODEC_ID_WMV3:
         s->h263_msmpeg4 = 1;
         s->h263_pred = 1;