[vala] gobject-2.0: Add DestroysInstance to Binding.unbind()

[Luca Bruno <lucabru src gnome org>]

commit e9ef9b97ee54dfd0a6f4c77acbf278266757e469
Author: Luca Bruno <luca bruno immobiliare it>
Date:   Fri Nov 14 16:30:17 2014 +0100

    gobject-2.0: Add DestroysInstance to Binding.unbind()
    
    Fixes bug 740117

 vapi/gobject-2.0.vapi |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/vapi/gobject-2.0.vapi b/vapi/gobject-2.0.vapi
index 0c3521f..85b1d7d 100644
--- a/vapi/gobject-2.0.vapi
+++ b/vapi/gobject-2.0.vapi
@@ -315,6 +315,7 @@ namespace GLib {
                public weak GLib.Object target { get; }
                public string target_property { get; }
                public GLib.BindingFlags flags { get; }
+               [DestroysInstance]
                public void unbind ();
        }