[gtk/gtk-3-22] Ignore deprecations for gdk_flush()

[Emmanuele Bassi <ebassi src gnome org>]

commit 382d6c1bcb683291ef7073ea83a95a524cf68b6e
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Sun Feb 11 15:13:06 2018 +0000

    Ignore deprecations for gdk_flush()
    
    When terminating the main loop, we're really trying to flush all
    GdkDisplay connections, so it's actually a legitimate internal use
    case.

 gtk/gtkmain.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/gtk/gtkmain.c b/gtk/gtkmain.c
index a9b9481c63..74ce18009d 100644
--- a/gtk/gtkmain.c
+++ b/gtk/gtkmain.c
@@ -1322,7 +1322,10 @@ gtk_main (void)
       gdk_threads_leave ();
       g_main_loop_run (loop);
       gdk_threads_enter ();
+
+      G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
       gdk_flush ();
+      G_GNUC_END_IGNORE_DEPRECATIONS;
     }
 
   main_loops = g_slist_remove (main_loops, loop);