fix compilation in wxUSE_MENUS==0 case to fix wxDFB build [backport from HEAD]

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@45828 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/srchctrl.h

@@ -52,9 +52,11 @@ public:
     wxSearchCtrlBase() { }
     virtual ~wxSearchCtrlBase() { }
 
-    // search control 
+    // search control
+#if wxUSE_MENUS
     virtual void SetMenu(wxMenu *menu) = 0;
     virtual wxMenu *GetMenu() = 0;
+#endif // wxUSE_MENUS
 
     // get/set options
     virtual void ShowSearchButton( bool show ) = 0;