[clutter] Depend on GLib 2.31

[Emmanuele Bassi <ebassi src gnome org>]

commit 1465aa04aa4a8da7ced0eeadb183083a8972a6bf
Author: Emmanuele Bassi <ebassi linux intel com>
Date:   Tue Sep 27 14:21:41 2011 +0100

    Depend on GLib 2.31
    
    We need to switch away from GStaticMutex and use GMutex instead, as the
    former has been deprecated.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index a7a21bd..279b621 100644
--- a/configure.ac
+++ b/configure.ac
@@ -113,7 +113,7 @@ LT_INIT([disable-static])
 AC_HEADER_STDC
 
 # required versions for dependencies
-m4_define([glib_req_version],           [2.28.0])
+m4_define([glib_req_version],           [2.31.0])
 m4_define([cogl_req_version],           [1.8.0])
 m4_define([json_glib_req_version],      [0.12.0])
 m4_define([atk_req_version],            [2.1.5])