[vala] glib-2.0: Fix Variant.dup_string binding.

[Evan Nemerson <evann src gnome org>]

commit b4d48bcb39e3b5d0a58826882a943cf325751335
Author: Evan Nemerson <evan coeus-group com>
Date:   Sat Aug 21 20:47:28 2010 -0700

    glib-2.0: Fix Variant.dup_string binding.

 vapi/glib-2.0.vapi |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/vapi/glib-2.0.vapi b/vapi/glib-2.0.vapi
index 84cb635..d2b7d03 100644
--- a/vapi/glib-2.0.vapi
+++ b/vapi/glib-2.0.vapi
@@ -4094,7 +4094,7 @@ namespace GLib {
 		public int32 get_handle ();
 		public double get_double ();
 		public unowned string get_string (out size_t length = null);
-		public string dup_string ();
+		public string dup_string (out size_t length = null);
 		public unowned string get_bytestring ();
 		public string dup_bytestring ();