lavf: move libmodplug registration with the other ext lib.

Also remove the duplicated #if.

libavformat/allformats.c

@@ -269,10 +269,6 @@ void av_register_all(void)
     REGISTER_DEMUXER  (YOP, yop);
     REGISTER_MUXDEMUX (YUV4MPEGPIPE, yuv4mpegpipe);
 
-    /* external libraries */
-#if CONFIG_LIBMODPLUG
-    REGISTER_DEMUXER  (LIBMODPLUG, libmodplug);
-#endif
     /* protocols */
 #if FF_API_APPLEHTTP_PROTO
     REGISTER_PROTOCOL (APPLEHTTP, applehttp);
@@ -306,6 +302,7 @@ void av_register_all(void)
     REGISTER_PROTOCOL (UDP, udp);
 
     /* external libraries */
+    REGISTER_DEMUXER  (LIBMODPLUG, libmodplug);
     REGISTER_MUXDEMUX (LIBNUT, libnut);
     REGISTER_PROTOCOL (LIBRTMP, librtmp);
     REGISTER_PROTOCOL (LIBRTMPE, librtmpe);