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

diff --git a/procps/fuser.c b/procps/fuser.c
index 60c1095..36d634d 100644
--- a/procps/fuser.c
+++ b/procps/fuser.c
@@ -316,7 +316,7 @@
 	return success;
 }
 
-int fuser_main(int argc, char **argv);
+int fuser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int fuser_main(int argc, char **argv)
 {
 	/*static -- huh???*/ int opt = 0; /* FUSER_OPT_ */