OS/2 update for wxUniv merge.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@10873 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/listctrl.h

@@ -189,6 +189,10 @@ protected:
     friend wxListMainWindow;
 
 private:
+    // Virtual function hiding supression
+    void Update(void)
+    { wxWindowBase::Update(); }
+
     // create the header window
     void CreateHeaderWindow();