avformat/movenc: Add loction/xyz support to allow copying data between mov files

Fixes Ticket4337
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/movenc.c

@@ -3080,6 +3080,7 @@ static int mov_write_udta_tag(AVIOContext *pb, MOVMuxContext *mov,
         mov_write_string_metadata(s, pb_buf, "\251cpy", "copyright",   0);
         mov_write_string_metadata(s, pb_buf, "\251mak", "make",        0);
         mov_write_string_metadata(s, pb_buf, "\251mod", "model",       0);
+        mov_write_string_metadata(s, pb_buf, "\251xyz", "location",    0);
         mov_write_raw_metadata_tag(s, pb_buf, "XMP_", "xmp");
     } else {
         /* iTunes meta data */