[gtk+/gtk-3-22] gdkdisplay-win32.c: Define _WIN32_WINNT

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

commit 27b68ff1931a2750a1a3effd6a06414142630867
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Fri Nov 11 20:53:41 2016 +0800

    gdkdisplay-win32.c: Define _WIN32_WINNT
    
    ... to be for Vista (0x0600) or later.  This is so that the necessary
    items in the Windows headers be activated so that the code will build
    properly on mingw-w64, and we already require Vista or later for GTK+.
    
    Thanks Ting-Wei Lan for pointing this out.
    
    See: https://bugzilla.gnome.org/show_bug.cgi?id=768081#c62

 gdk/win32/gdkdisplay-win32.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/gdk/win32/gdkdisplay-win32.c b/gdk/win32/gdkdisplay-win32.c
index 9267640..ceec5b3 100644
--- a/gdk/win32/gdkdisplay-win32.c
+++ b/gdk/win32/gdkdisplay-win32.c
@@ -17,6 +17,9 @@
  */
 
 #include "config.h"
+
+#define _WIN32_WINNT 0x0600
+
 #include "gdk.h"
 #include "gdkprivate-win32.h"
 #include "gdkdisplay-win32.h"