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

diff --git a/modutils/lsmod.c b/modutils/lsmod.c
index 09b03d0..7014681 100644
--- a/modutils/lsmod.c
+++ b/modutils/lsmod.c
@@ -74,7 +74,7 @@
 	NEW_MOD_INITIALIZING = 64
 };
 
-int lsmod_main(int argc, char **argv);
+int lsmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int lsmod_main(int argc, char **argv)
 {
 	struct module_info info;
@@ -140,7 +140,7 @@
 
 #else /* CONFIG_FEATURE_QUERY_MODULE_INTERFACE */
 
-int lsmod_main(int argc, char **argv);
+int lsmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int lsmod_main(int argc, char **argv)
 {
 	FILE *file = xfopen("/proc/modules", "r");