closed gop support & flags2 as all bits in flags are used

and a few minor things i forgot to commit ...

Originally committed as revision 2718 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/h263dec.c

@@ -393,6 +393,7 @@ uint64_t time= rdtsc();
     printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
 #endif
     s->flags= avctx->flags;
+    s->flags2= avctx->flags2;
 
     *data_size = 0;