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

diff --git a/findutils/find.c b/findutils/find.c
index b618814..9efe2db 100644
--- a/findutils/find.c
+++ b/findutils/find.c
@@ -794,7 +794,7 @@
 }
 
 
-int find_main(int argc, char **argv);
+int find_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int find_main(int argc, char **argv)
 {
 	static const char options[] ALIGN1 =