add -fvisibility=hidden to CC flags, mark XXX_main functions
EXTERNALLY_VISIBLE. 5% size reduction of libbusybox.so

diff --git a/coreutils/chmod.c b/coreutils/chmod.c
index dd7b784..a58e4f8 100644
--- a/coreutils/chmod.c
+++ b/coreutils/chmod.c
@@ -67,7 +67,7 @@
 	return FALSE;
 }
 
-int chmod_main(int argc, char **argv);
+int chmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int chmod_main(int argc, char **argv)
 {
 	int retval = EXIT_SUCCESS;