gtk-menu-popup-delay only deprecated in gtk3 I think

Change-Id: I4bf77a912296f2d4a14c8bedf6b6bed6b52f9023

vcl/unx/gtk/gdi/salnativewidgets-gtk.cxx

@@ -4159,19 +4159,19 @@ void GtkSalGraphics::updateSettings( AllSettings& rSettings )
         aStyleSet.SetCursorBlinkTime( STYLE_CURSOR_NOBLINKTIME );
 
     MouseSettings aMouseSettings = rSettings.GetMouseSettings();
-    int iDoubleClickTime, iDoubleClickDistance, iDragThreshold;
-    static const int MENU_POPUP_DELAY = 225;
+    int iDoubleClickTime, iDoubleClickDistance, iDragThreshold, iMenuPopupDelay;
     g_object_get( pSettings,
                   "gtk-double-click-time", &iDoubleClickTime,
                   "gtk-double-click-distance", &iDoubleClickDistance,
                   "gtk-dnd-drag-threshold", &iDragThreshold,
+                  "gtk-menu-popup-delay", &iMenuPopupDelay,
                   nullptr );
     aMouseSettings.SetDoubleClickTime( iDoubleClickTime );
     aMouseSettings.SetDoubleClickWidth( iDoubleClickDistance );
     aMouseSettings.SetDoubleClickHeight( iDoubleClickDistance );
     aMouseSettings.SetStartDragWidth( iDragThreshold );
     aMouseSettings.SetStartDragHeight( iDragThreshold );
-    aMouseSettings.SetMenuDelay( MENU_POPUP_DELAY );
+    aMouseSettings.SetMenuDelay( iMenuPopupDelay );
     rSettings.SetMouseSettings( aMouseSettings );
 
     gboolean showmenuicons = true, primarybuttonwarps = false;