[vala] gdl-3.0: Update after the GdkEvent change from struct to class

[Luca Bruno <lucabru src gnome org>]

commit 46288a083f67216cc5ace1a30ac16c8d4fb0fb4e
Author: Luca Bruno <lucabru src gnome org>
Date:   Sat Apr 5 19:34:13 2014 +0200

    gdl-3.0: Update after the GdkEvent change from struct to class

 vapi/gdl-3.0.vapi |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/vapi/gdl-3.0.vapi b/vapi/gdl-3.0.vapi
index 7fbf9d0..6fc5186 100644
--- a/vapi/gdl-3.0.vapi
+++ b/vapi/gdl-3.0.vapi
@@ -266,7 +266,7 @@ namespace Gdl {
        public class DockTablabel : Gtk.Bin, Atk.Implementor, Gtk.Buildable {
                public bool active;
                public uint drag_handle_size;
-               public Gdk.EventButton drag_start_event;
+               public weak Gdk.EventButton drag_start_event;
                public weak Gdk.Window event_window;
                public bool pre_drag;
                [CCode (has_construct_function = false, type = "GtkWidget*")]