suppress warnings about easch <applet>_main() having
no preceding prototype
diff --git a/coreutils/diff.c b/coreutils/diff.c
index c846e2b..31c20f0 100644
--- a/coreutils/diff.c
+++ b/coreutils/diff.c
@@ -1170,6 +1170,7 @@
 #endif
 
 
+int diff_main(int argc, char **argv);
 int diff_main(int argc, char **argv)
 {
 	bool gotstdin = 0;