move ff_url_split() and ff_url_join() declarations to internal.h

those functions are not part of the public API

Originally committed as revision 22534 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/gopher.c

@@ -24,6 +24,7 @@
 
 #include "libavutil/avstring.h"
 #include "avformat.h"
+#include "internal.h"
 #include "network.h"
 
 typedef struct {