suppress warnings about easch <applet>_main() having

no preceding prototype

util-linux/switch_root.c

@@ -63,6 +63,7 @@ static void delete_contents(const char *directory)
 	} else unlink(directory);
 }
 
+int switch_root_main(int argc, char *argv[]);
 int switch_root_main(int argc, char *argv[])
 {
 	char *newroot, *console=NULL;