[gtkmm] Settings: Add the gtk_long_press_time property.

[Murray Cumming <murrayc src gnome org>]

commit cbead60eb0823996311e8c8c3c57a7c6c03f85dd
Author: Murray Cumming <murrayc murrayc com>
Date:   Mon Sep 15 16:46:30 2014 +0200

    Settings: Add the gtk_long_press_time property.

 gtk/src/settings.hg |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtk/src/settings.hg b/gtk/src/settings.hg
index 6ae5429..87ca71c 100644
--- a/gtk/src/settings.hg
+++ b/gtk/src/settings.hg
@@ -136,6 +136,8 @@ public:
 
   _WRAP_PROPERTY("gtk-decoration-layout", Glib::ustring) // since 3.12
   _WRAP_PROPERTY("gtk-dialogs-use-header", bool) // since 3.12
+
+  _WRAP_PROPERTY("gtk-long-press-time", guint) // since 3.14
 };
 
 } //namespace Gtk