[gtkmm] Application: add/remove_accelerator(): Add overloads without the variant parameter.

[Murray Cumming <murrayc src gnome org>]

commit ff210002ec745ccd18cf8b495e2835f65599d44b
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Oct 9 10:28:23 2013 +0200

    Application: add/remove_accelerator(): Add overloads without the variant parameter.
    
    * gtk/src/application.hg: Use the {?} syntax to add methods that
      do not take the parameter.

 gtk/src/application.hg |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/gtk/src/application.hg b/gtk/src/application.hg
index 26f4cef..ac471ad 100644
--- a/gtk/src/application.hg
+++ b/gtk/src/application.hg
@@ -299,11 +299,11 @@ public:
 
   _WRAP_METHOD(void set_menubar(const Glib::RefPtr<Gio::MenuModel>& menubar), gtk_application_set_menubar)
 
-  //TODO: Add a version that takes a VariantBase and deprecate this method:
-  _WRAP_METHOD(void add_accelerator(const Glib::ustring& accelerator, const Glib::ustring& action_name, 
GVariant        * parameter), gtk_application_add_accelerator)
+  //TODO: Add a *_variant() version that takes a VariantBase, add a templated method, and remove this method 
when we can break ABI:
+  _WRAP_METHOD(void add_accelerator(const Glib::ustring& accelerator, const Glib::ustring& action_name, 
GVariant* parameter{?}), gtk_application_add_accelerator)
 
-  //TODO: Add a version that takes a VariantBase and deprecate this method:
-  _WRAP_METHOD(void remove_accelerator(const Glib::ustring& action_name, GVariant* parameter), 
gtk_application_remove_accelerator)
+  //TODO: Add a *_variant() version that takes a VariantBase, add a templated method, and remove this method 
when we can break ABI:
+  _WRAP_METHOD(void remove_accelerator(const Glib::ustring& action_name, GVariant* parameter{?}), 
gtk_application_remove_accelerator)
 
   _WRAP_METHOD(guint inhibit(Window& window, ApplicationInhibitFlags flags, const Glib::ustring& reason), 
gtk_application_inhibit)
   _WRAP_METHOD(void uninhibit(guint cookie), gtk_application_uninhibit)