[pygobject] Drop obsolete pygobject_register_sinkfunc() declaration

[Martin Pitt <martinpitt src gnome org>]

commit 08c97b0bd3140921f1b5c74f7764e23d3a9bf0ee
Author: Martin Pitt <martinpitt gnome org>
Date:   Wed Feb 27 15:39:23 2013 +0100

    Drop obsolete pygobject_register_sinkfunc() declaration
    
    There is no definition for this any more, nor is it being used anywhere.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=639849

 gi/_gobject/pygobject-private.h |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)
---
diff --git a/gi/_gobject/pygobject-private.h b/gi/_gobject/pygobject-private.h
index be2b6e3..e1fc2b6 100644
--- a/gi/_gobject/pygobject-private.h
+++ b/gi/_gobject/pygobject-private.h
@@ -158,8 +158,6 @@ PyObject *    pygobject_new_full         (GObject *obj, gboolean steal, gpointer
 void          pygobject_sink             (GObject *obj);
 PyTypeObject *pygobject_lookup_class     (GType gtype);
 void          pygobject_watch_closure    (PyObject *self, GClosure *closure);
-void          pygobject_register_sinkfunc(GType type,
-                                         void (* sinkfunc)(GObject *object));
 int           pyg_type_register          (PyTypeObject *class,
                                          const gchar *type_name);