[gtk+/gtk-3-22] gtk/gtkmenu.c: Avoid compound literals

[Chun-wei Fan <fanchunwei src gnome org>]

commit 45cf4c7d570a2620a6ee5b829adbd39cb66fa951
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Fri Oct 28 15:49:29 2016 +0800

    gtk/gtkmenu.c: Avoid compound literals
    
    We only start requiring compound literals from GTK+-3.90, so fix this so
    that pre-C99 compilers can build GTK+-3.22 properly.

 gtk/gtkmenu.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkmenu.c b/gtk/gtkmenu.c
index e77817f..663454a 100644
--- a/gtk/gtkmenu.c
+++ b/gtk/gtkmenu.c
@@ -5202,7 +5202,10 @@ gtk_menu_position (GtkMenu  *menu,
 
       if (grab_device && attach_widget)
         {
-          rect = (GdkRectangle) { 0, 0, 1, 1 };
+          rect.x = 0;
+          rect.y = 0;
+          rect.width = 1;
+          rect.height = 1;
 
           rect_window = gtk_widget_get_window (attach_widget);
           gdk_window_get_device_position (rect_window, grab_device,