[gtksourceview/gnome-3-22] Include windef instead of windows

[Ignacio Casal Quinteiro <icq src gnome org>]

commit 58b5e61e0b2b11da5111b37e057348ca1f69b7f2
Author: Ignacio Casal Quinteiro <icq gnome org>
Date:   Thu Dec 1 17:22:36 2016 +0100

    Include windef instead of windows
    
    This seems to get us a step forward on building with msys2

 gtksourceview/gtksourceview-init.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtksourceview/gtksourceview-init.c b/gtksourceview/gtksourceview-init.c
index edefc87..e285d47 100644
--- a/gtksourceview/gtksourceview-init.c
+++ b/gtksourceview/gtksourceview-init.c
@@ -37,7 +37,7 @@
 #include "gtksourcestyleschememanager.h"
 
 #ifdef G_OS_WIN32
-#include <windows.h>
+#include <windef.h>
 
 static HMODULE gtksourceview_dll;
 #endif