gobject: add support for g_auto() and g_autoptr()

Add support to libgobject types for the new cleanup macros.

https://bugzilla.gnome.org/show_bug.cgi?id=743640

glib/glib-object.h

@@ -35,6 +35,8 @@
 #include <gobject/gvaluearray.h>
 #include <gobject/gvaluetypes.h>
 
+#include <gobject/gobject-autocleanups.h>
+
 #undef __GLIB_GOBJECT_H_INSIDE__
 
 #endif /* __GLIB_GOBJECT_H__ */