[metacity/gnome-3-22] menu: avoid a deprecation warning

[Alberts Muktupāvels <muktupavels src gnome org>]

commit d226b34df5514f41535819dc2cc61ef1752201ed
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Oct 16 23:21:25 2016 +0300

    menu: avoid a deprecation warning

 src/ui/menu.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/ui/menu.c b/src/ui/menu.c
index 52df466..5fdaca2 100644
--- a/src/ui/menu.c
+++ b/src/ui/menu.c
@@ -494,11 +494,13 @@ meta_window_menu_popup (MetaWindowMenu     *menu,
   pt->x = root_x;
   pt->y = root_y;
 
+  G_GNUC_BEGIN_IGNORE_DEPRECATIONS
   gtk_menu_popup (GTK_MENU (menu->menu),
                   NULL, NULL,
                   popup_position_func, pt,
                   button,
                   timestamp);
+  G_GNUC_END_IGNORE_DEPRECATIONS
 
   if (!gtk_widget_get_visible (menu->menu))
     meta_warning ("GtkMenu failed to grab the pointer\n");