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

diff --git a/selinux/setfiles.c b/selinux/setfiles.c
index 5ae482e..905333f 100644
--- a/selinux/setfiles.c
+++ b/selinux/setfiles.c
@@ -486,7 +486,7 @@
 	goto out;
 }
 
-int setfiles_main(int argc, char **argv);
+int setfiles_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int setfiles_main(int argc, char **argv)
 {
 	struct stat sb;