[cluttermm_tutorial] actor_events example: Comment out unused parameters.

[Murray Cumming <murrayc src gnome org>]

commit abd2ba61a6cf9e275cb3a8cb14088e30f50295a3
Author: Murray Cumming <murrayc murrayc com>
Date:   Mon Mar 28 20:39:43 2016 +0200

    actor_events example: Comment out unused parameters.

 examples/actor_events/main.cc |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/examples/actor_events/main.cc b/examples/actor_events/main.cc
index 589bc84..488eaa0 100644
--- a/examples/actor_events/main.cc
+++ b/examples/actor_events/main.cc
@@ -33,14 +33,14 @@ bool on_my_button_release(Clutter::ButtonEvent* event, const Glib::RefPtr<Clutte
   return true;
 }
 
-bool on_my_mouse_enter(Clutter::CrossingEvent* event, const Glib::RefPtr<Clutter::Group>& g)
+bool on_my_mouse_enter(Clutter::CrossingEvent* event, const Glib::RefPtr<Clutter::Group>& /* g */)
 {
   //g->set_scale(1.00, 3.00);
   std::cout << "mouse entered at " << event->x << "/ " << event->y << std::endl;
   return true;
 }
 
-bool on_my_mouse_leave(Clutter::CrossingEvent* event, const Glib::RefPtr<Clutter::Group>& g)
+bool on_my_mouse_leave(Clutter::CrossingEvent* event, const Glib::RefPtr<Clutter::Group>& /* g */)
 {
   //g->set_scale(3.00, 1.00);