[glibmm] Fix "make check" after sigc::mem_fun(pointer, func) was deprecated

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 74e8088b9694ac68abf98bb52e7e09398b3f6207
Author: Kjell Ahlstedt <kjell ahlstedt bredband net>
Date:   Thu Mar 10 19:41:45 2016 +0100

    Fix "make check" after sigc::mem_fun(pointer,func) was deprecated

 tests/glibmm_refptr_sigc_bind/main.cc |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/tests/glibmm_refptr_sigc_bind/main.cc b/tests/glibmm_refptr_sigc_bind/main.cc
index 7d3546a..826b915 100644
--- a/tests/glibmm_refptr_sigc_bind/main.cc
+++ b/tests/glibmm_refptr_sigc_bind/main.cc
@@ -36,10 +36,10 @@ public:
   {
 // std::cout << "new Test" << std::endl;
 #ifdef ACTIVATE_BUG // See https://bugzilla.gnome.org/show_bug.cgi?id=564005#c15s
-    action->signal_sig1().connect(sigc::bind(sigc::mem_fun(this, &Test::on_sig1), action));
+    action->signal_sig1().connect(sigc::bind(sigc::mem_fun(*this, &Test::on_sig1), action));
 #else
     Glib::RefPtr<Action> action2(new Action);
-    action->signal_sig1().connect(sigc::bind(sigc::mem_fun(this, &Test::on_sig1), action2));
+    action->signal_sig1().connect(sigc::bind(sigc::mem_fun(*this, &Test::on_sig1), action2));
 #endif
   }