dont write udta atom for 3gp/3g2 for now, current written atoms (ilst) are itunes specific

Originally committed as revision 10757 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/movenc.c

@@ -1383,7 +1383,7 @@ static int mov_write_moov_tag(ByteIOContext *pb, MOVContext *mov,
 
     if (mov->mode == MODE_PSP)
         mov_write_uuidusmt_tag(pb, s);
-    else
+    else if (mov->mode != MODE_3GP && mov->mode != MODE_3G2)
         mov_write_udta_tag(pb, mov, s);
 
     return updateSize(pb, pos);