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

diff --git a/sysklogd/klogd.c b/sysklogd/klogd.c
index 2af4105..1164246 100644
--- a/sysklogd/klogd.c
+++ b/sysklogd/klogd.c
@@ -35,7 +35,7 @@
 #define KLOGD_LOGBUF_SIZE BUFSIZ
 #define log_buffer bb_common_bufsiz1
 
-int klogd_main(int argc, char **argv);
+int klogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int klogd_main(int argc, char **argv)
 {
 	int i = i; /* silence gcc */