[gtk+/gtk-3-22] quartz: fix build for <10.12

[Matthias Clasen <matthiasc src gnome org>]

commit 64ec7c26404f4a315d20ef0971ba521976afcccd
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Tue Mar 14 20:53:09 2017 +0100

    quartz: fix build for <10.12
    
    The style mask type was changed from NSUInteger to NSWindowStyleMask.
    Use NSUInteger so it also works on older macOS.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=780019

 gdk/quartz/gdkwindow-quartz.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gdk/quartz/gdkwindow-quartz.c b/gdk/quartz/gdkwindow-quartz.c
index f868f35..6878e52 100644
--- a/gdk/quartz/gdkwindow-quartz.c
+++ b/gdk/quartz/gdkwindow-quartz.c
@@ -2496,7 +2496,7 @@ gdk_quartz_window_set_functions (GdkWindow    *window,
 
   if (impl->toplevel)
     {
-      NSWindowStyleMask mask = [impl->toplevel styleMask];
+      NSUInteger mask = [impl->toplevel styleMask];
 
       if (min)
         mask = mask | NSMiniaturizableWindowMask;