[gtk+] build: Bump atk dependency to 2.7.5

[Rob Bradford <rbradford src gnome org>]

commit 898d5776755281a1de1179516f38ae917ea16d50
Author: Rob Bradford <rob linux intel com>
Date:   Tue Feb 5 18:36:48 2013 +0000

    build: Bump atk dependency to 2.7.5
    
    The following patch added a dependency on a new API first available in that
    release:
    
    commit 92f0c5c38476687a9a50c31eac4f674a7e0b9c91
    Author: Mike Gorse <mgorse suse com>
    Date:   Mon Dec 3 16:07:23 2012 -0600
    
        Add accessibility for GtkLevelBar and value test

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index df2c6dc..3d11488 100644
--- a/configure.ac
+++ b/configure.ac
@@ -44,7 +44,7 @@ m4_define([gtk_binary_version], [3.0.0])
 # required versions of other packages
 m4_define([glib_required_version], [2.35.3])
 m4_define([pango_required_version], [1.32.4])
-m4_define([atk_required_version], [2.7.4])
+m4_define([atk_required_version], [2.7.5])
 m4_define([cairo_required_version], [1.10.0])
 m4_define([gdk_pixbuf_required_version], [2.27.1])
 m4_define([introspection_required_version], [1.32.0])