add static to internal function

Change-Id: Ia285a3f0f7905bf4834380530d0c0eb7fdf730c6
diff --git a/ssl/ssl_lib.c b/ssl/ssl_lib.c
index f86a96f..905656e 100644
--- a/ssl/ssl_lib.c
+++ b/ssl/ssl_lib.c
@@ -2459,7 +2459,7 @@
 	return(NULL);
 	}
 
-const char *ssl_get_version(int version)
+static const char *ssl_get_version(int version)
 	{
 	if (version == TLS1_VERSION)
 		return("TLSv1");