[gtk+] testgtk: Compile without warnings on win32

[Benjamin Otte <otte src gnome org>]

commit b561af25ece7d07d3ee99d232617e76217f2c4b3
Author: Benjamin Otte <otte gnome org>
Date:   Sun Feb 7 19:18:18 2016 +0100

    testgtk: Compile without warnings on win32

 tests/testgtk.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/tests/testgtk.c b/tests/testgtk.c
index a4ef9b2..32a831a 100644
--- a/tests/testgtk.c
+++ b/tests/testgtk.c
@@ -4948,6 +4948,7 @@ static void
 change_cursor_theme (GtkWidget *widget,
                     gpointer   data)
 {
+#if defined(GDK_WINDOWING_X11) || defined (GDK_WINDOWING_WAYLAND)
   const gchar *theme;
   gint size;
   GList *children;
@@ -4969,6 +4970,7 @@ change_cursor_theme (GtkWidget *widget,
   if (GDK_IS_WAYLAND_DISPLAY (display))
     gdk_wayland_display_set_cursor_theme (display, theme, size);
 #endif
+#endif
 }