remove dbus-c++ warning ( unused variable )

libs/dbus-c++/include/dbus-c++/server.h

@@ -63,7 +63,7 @@ public:
 
 protected:
 
-	Server(const Server &s)
+	Server(const Server & /* s */)
 	{}
 
 	virtual void on_new_connection(Connection &c) = 0;