suppress warnings about easch <applet>_main() having

no preceding prototype

networking/arp.c

@@ -441,6 +441,7 @@ static int arp_show(char *name)
 	return 0;
 }
 
+int arp_main(int argc, char **argv);
 int arp_main(int argc, char **argv)
 {
 	char *hw_type;