lavf: add support for libgme

Reviewed-by: Stefano Sabatini <stefasab@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/allformats.c

@@ -337,6 +337,7 @@ void av_register_all(void)
     REGISTER_PROTOCOL(UDP,              udp);
 
     /* external libraries */
+    REGISTER_DEMUXER (LIBGME,           libgme);
     REGISTER_DEMUXER (LIBMODPLUG,       libmodplug);
     REGISTER_MUXDEMUX(LIBNUT,           libnut);
     REGISTER_DEMUXER (LIBQUVI,          libquvi);