[gtkmm] Gtk::AccelGroup: Remove signal_accel_activate()

[Kjell Ahlstedt <kjellahl src gnome org>]

commit d1e7b634fe6d7f24c2c2ff06d3c289296b37ea4b
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Fri Sep 15 13:40:58 2017 +0200

    Gtk::AccelGroup: Remove signal_accel_activate()
    
    The documentation of GtkAccelGroup::accel-activate says "The accel-activate
    signal is an implementation detail of GtkAccelGroup and not meant to be
    used by applications." Remove signal_accel_activate().

 gtk/src/accelgroup.hg |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/gtk/src/accelgroup.hg b/gtk/src/accelgroup.hg
index f532e71..0d4c4bd 100644
--- a/gtk/src/accelgroup.hg
+++ b/gtk/src/accelgroup.hg
@@ -110,8 +110,7 @@ public:
 
   //TODO: _WRAP_METHOD(static bool activate(Object& object, guint accel_key, Gdk::ModifierType accel_mods), 
gtk_accel_groups_activate)
 
-#m4 _CONVERSION(`GObject*',`const Glib::RefPtr<Glib::Object>&',`Glib::wrap($3, true)')
-  _WRAP_SIGNAL(bool accel_activate(const Glib::RefPtr<Glib::Object>& acceleratable, guint keyval, 
Gdk::ModifierType modifier), "accel_activate", no_default_handler)
+  _IGNORE_SIGNAL(accel_activate) dnl // Not meant to be used by applications.
 
   //TODO: The C type is unpleasant:
   //This has C docs, but it isn't worth mentioning them for such a useless signal. murrayc.