[vala] glib-2.0: Add RecMutexLocker since 2.60

[Rico Tzschichholz <ricotz src gnome org>]

commit 5716771ce6e8056314c18777ad439bf00f8aac1a
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Sun Jan 6 17:22:41 2019 +0100

    glib-2.0: Add RecMutexLocker since 2.60

 vapi/glib-2.0.vapi | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/vapi/glib-2.0.vapi b/vapi/glib-2.0.vapi
index 33b9a6024..7e53fc46f 100644
--- a/vapi/glib-2.0.vapi
+++ b/vapi/glib-2.0.vapi
@@ -2082,6 +2082,13 @@ namespace GLib {
                public void unlock ();
        }
 
+       [Version (since = "2.60")]
+       [CCode (destroy_function = "g_rec_mutex_locker_free")]
+       public struct RecMutexLocker {
+               public RecMutexLocker (RecMutex rec_mutex);
+               public void free ();
+       }
+
        [Version (since = "2.32")]
        [CCode (destroy_function = "g_rw_lock_clear")]
        public struct RWLock {