xvid fake divx version workaround

Originally committed as revision 3595 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/h263dec.c

@@ -517,6 +517,11 @@ retry:
             s->divx_version= 400; //divx 4
     }
     
+    if(s->xvid_build && s->divx_version){
+        s->divx_version=
+        s->divx_build= 0;
+    }
+
     if(s->workaround_bugs&FF_BUG_AUTODETECT){
         s->workaround_bugs &= ~FF_BUG_NO_PADDING;