suppress warnings about easch <applet>_main() having

no preceding prototype

coreutils/sort.c

@@ -271,6 +271,7 @@ static unsigned str2u(char **str)
 }
 #endif
 
+int sort_main(int argc, char **argv);
 int sort_main(int argc, char **argv)
 {
 	FILE *fp, *outfile = stdout;