[vala/staging] glib-2.0: Fix MutexLocker binding

[Rico Tzschichholz <ricotz src gnome org>]

commit 5b26f5d9b61617b4044b064bba10cb576bf52213
Author: Jeremy Philippe <jeremy philippe gmail com>
Date:   Mon Sep 2 01:27:44 2019 +0200

    glib-2.0: Fix MutexLocker binding

 vapi/glib-2.0.vapi | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/vapi/glib-2.0.vapi b/vapi/glib-2.0.vapi
index 966abb518..307140778 100644
--- a/vapi/glib-2.0.vapi
+++ b/vapi/glib-2.0.vapi
@@ -2070,9 +2070,11 @@ namespace GLib {
        }
 
        [Version (since = "2.44")]
-       [CCode (destroy_function = "g_mutex_locker_free")]
-       public struct MutexLocker {
+       [Compact]
+       [CCode (free_function = "g_mutex_locker_free")]
+       public class MutexLocker {
                public MutexLocker (Mutex mutex);
+               [DestroysInstance]
                public void free ();
        }