[gtkmm] Fix typo to fix the build.

[Murray Cumming <murrayc src gnome org>]

commit 2f8fd95b12fda65667a526f5768fcccfb8f22b60
Author: Murray Cumming <murrayc murrayc com>
Date:   Thu Aug 30 01:29:42 2012 +0200

    Fix typo to fix the build.

 tools/m4/convert_gtk.m4 |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/tools/m4/convert_gtk.m4 b/tools/m4/convert_gtk.m4
index d41561c..afb36de 100644
--- a/tools/m4/convert_gtk.m4
+++ b/tools/m4/convert_gtk.m4
@@ -691,7 +691,7 @@ _CONVERSION(`const Glib::RefPtr<const Gio::MenuModel>&',`GMenuModel*',__CONVERT_
 _CONVERSION(`GMenuModel*',`Glib::RefPtr<Gio::MenuModel>',`Glib::wrap($3)')
 _CONVERSION(`GMenuModel*',`Glib::RefPtr<const Gio::MenuModel>',`Glib::wrap($3)')
 
-_CONVERSION(`const Glib::RefPtr<Gio::ActionGroup>&',`GActionGroup*',__CONVERT_CONST_REFPTR_TO_P_SUN(Gio::AppInfo))
+_CONVERSION(`const Glib::RefPtr<Gio::ActionGroup>&',`GActionGroup*',__CONVERT_CONST_REFPTR_TO_P_SUN(Gio::ActionGroup))
 
 _CONVERSION(`GtkDragResult',`DragResult',`($2)$3')