lavf: add init_put_byte() to the list of visible symbols.

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

libavformat/libavformat.v

@@ -28,5 +28,6 @@ LIBAVFORMAT_$MAJOR {
                 udp_set_remote_url;
                 udp_get_local_port;
                 init_checksum;
+                init_put_byte;
         local: *;
 };