[gtk+] Bump ATK dependency to 2.12

[Kalev Lember <klember src gnome org>]

commit edb4c65c5b0ed4b47843f25ef4af284228bc51f0
Author: Kalev Lember <kalevlember gmail com>
Date:   Sun May 25 00:17:55 2014 +0200

    Bump ATK dependency to 2.12
    
    ... for the new AtkValue interface that we implement.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index c944928..f4d76e1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -43,7 +43,7 @@ m4_define([gtk_binary_version], [3.0.0])
 # required versions of other packages
 m4_define([glib_required_version], [2.39.5])
 m4_define([pango_required_version], [1.32.4])
-m4_define([atk_required_version], [2.7.5])
+m4_define([atk_required_version], [2.12.0])
 m4_define([cairo_required_version], [1.12.0])
 m4_define([gdk_pixbuf_required_version], [2.27.1])
 m4_define([introspection_required_version], [1.39.0])