suppress warnings about easch <applet>_main() having
no preceding prototype
diff --git a/coreutils/echo.c b/coreutils/echo.c
index 0c8eac3..8270fc0 100644
--- a/coreutils/echo.c
+++ b/coreutils/echo.c
@@ -112,6 +112,7 @@
 	return 0;
 }
 
+int echo_main(int argc, char** argv);
 int echo_main(int argc, char** argv)
 {
 	(void)bb_echo(argv);