[gtk+/native-layout] Check for __MINGW64__ and not __MINGW64

[Tristan Van Berkom <tvb src gnome org>]

commit 2b1ec1b227042434925bcfdb7ef1b8cc81cba0c1
Author: Tor Lillqvist <tml iki fi>
Date:   Fri Mar 12 11:44:32 2010 +0200

    Check for __MINGW64__ and not __MINGW64
    
    Should fix bug #612308.

 gtk/gtkprintoperation-win32.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkprintoperation-win32.c b/gtk/gtkprintoperation-win32.c
index 79f747f..76f8a69 100644
--- a/gtk/gtkprintoperation-win32.c
+++ b/gtk/gtkprintoperation-win32.c
@@ -72,7 +72,7 @@ static void win32_poll_status (GtkPrintOperation *op);
 
 static const GUID myIID_IPrintDialogCallback  = {0x5852a2c3,0x6530,0x11d1,{0xb6,0xa3,0x0,0x0,0xf8,0x75,0x7b,0xf9}};
 
-#if !defined (_MSC_VER) && !defined (MINGW64) && !defined (__MINGW64)
+#if !defined (_MSC_VER) && !defined (MINGW64) && !defined (__MINGW64__)
 #undef INTERFACE
 #define INTERFACE IPrintDialogCallback
 DECLARE_INTERFACE_ (IPrintDialogCallback, IUnknown)