Fixes for wxUSE_STATUSBAR.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@28305 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/mdig.cpp

@@ -568,6 +568,8 @@ void wxGenericMDIChildFrame::OnMenuHighlight(wxMenuEvent& event)
         // but may be the MDI frame does?
         m_pMDIParentFrame->OnMenuHighlight(event);
     }
+#else
+    wxUnusedVar(event);
 #endif // wxUSE_STATUSBAR
 }