[glib] gtype – Mark _get_instance_private() function as G_GNUC_UNUSED

[Ryan Lortie <desrt src gnome org>]

commit 012011538f4513569f92e322c4377efa2cb64378
Author: Sebastian Dröge <sebastian centricular com>
Date:   Sun Feb 9 23:08:21 2014 +0100

    gtype – Mark _get_instance_private() function as G_GNUC_UNUSED
    
    clang likes to complain about it being unused.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=723899

 gobject/gtype.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gobject/gtype.h b/gobject/gtype.h
index a1c2d90..330620b 100644
--- a/gobject/gtype.h
+++ b/gobject/gtype.h
@@ -1672,6 +1672,7 @@ 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) \
 { \