[retro-gtk] reftest-file: Drop useless inclusion

[Adrien Plazas <aplazas src gnome org>]

commit c6da32dad17b4fde8afb7407f60ed76a1866cbb1
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Fri Apr 20 10:44:28 2018 +0200

    reftest-file: Drop useless inclusion

 tests/retro-reftest-file.h | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/tests/retro-reftest-file.h b/tests/retro-reftest-file.h
index d3d08c5..1b56d4e 100644
--- a/tests/retro-reftest-file.h
+++ b/tests/retro-reftest-file.h
@@ -1,7 +1,6 @@
 #pragma once
 
 #include <gio/gio.h>
-#include <glib-object.h>
 #define RETRO_GTK_USE_UNSTABLE_API
 #include <retro-gtk/retro-gtk.h>