[glib] gtypemodule: use G_GNUC_UNUSED in G_DEFINE_DYNAMIC_TYPE_EXTENDED

[Christian Hergert <chergert src gnome org>]

commit cb86c222cce2436d6a213e574fbba159b6f34010
Author: Christian Hergert <christian hergert me>
Date:   Sat Jun 27 22:41:13 2015 -0700

    gtypemodule: use G_GNUC_UNUSED in G_DEFINE_DYNAMIC_TYPE_EXTENDED
    
    We already do this in the normal case, might as well support it for the
    dynamic type module case as well. This prevents seeing a warning when not
    using the get_instance_private() in the dynamic type.

 gobject/gtypemodule.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gobject/gtypemodule.h b/gobject/gtypemodule.h
index 9c63bac..3ef0e84 100644
--- a/gobject/gtypemodule.h
+++ b/gobject/gtypemodule.h
@@ -182,6 +182,7 @@ static gint     TypeName##_private_offset; \
 \
 _G_DEFINE_TYPE_EXTENDED_CLASS_INIT(TypeName, type_name) \
 \
+G_GNUC_UNUSED \
 static inline gpointer \
 type_name##_get_instance_private (TypeName *self) \
 { \