avcodec/mpeg4videodec: update bug workaround related variables like they where before

This fixes the code after the variables have been moved into the
mpeg4 decoder.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/mpeg4videodec.c

@@ -2684,6 +2684,10 @@ static int mpeg4_update_thread_context(AVCodecContext *dst,
     s->time_increment_bits = s1->time_increment_bits;
     s->vol_sprite_usage    = s1->vol_sprite_usage;
     s->rvlc                = s1->rvlc;
+    s->divx_version        = s1->divx_version;
+    s->divx_build          = s1->divx_build;
+    s->xvid_build          = s1->xvid_build;
+    s->lavc_build          = s1->lavc_build;
 
     return 0;
 }