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

diff --git a/networking/netstat.c b/networking/netstat.c
index e5ed10e..11f1419 100644
--- a/networking/netstat.c
+++ b/networking/netstat.c
@@ -484,7 +484,7 @@
  * Our main function.
  */
 
-int netstat_main(int argc, char **argv);
+int netstat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int netstat_main(int argc, char **argv)
 {
 	const char *net_conn_line_header = PRINT_NET_CONN_HEADER;