Hide private library symbols

Signed-off-by: Peter Pentchev <roam@ringlet.net>
diff --git a/lib/client-handshake.c b/lib/client-handshake.c
index 79dba7b..de99a20 100644
--- a/lib/client-handshake.c
+++ b/lib/client-handshake.c
@@ -154,7 +154,7 @@
  *	This function creates a connection to a remote server
  */
 
-struct libwebsocket *
+LWS_VISIBLE struct libwebsocket *
 libwebsocket_client_connect(struct libwebsocket_context *context,
 			      const char *address,
 			      int port,
@@ -304,7 +304,7 @@
  *	This function creates a connection to a remote server
  */
 
-struct libwebsocket *
+LWS_VISIBLE struct libwebsocket *
 libwebsocket_client_connect_extended(struct libwebsocket_context *context,
 			      const char *address,
 			      int port,