[gnome-shell] build: Bump GTK+ requirement

[Florian Müllner <fmuellner src gnome org>]

commit d211680534b67e6adda31d0c2203a2bfa2a5faa4
Author: Florian Müllner <fmuellner gnome org>
Date:   Sun Sep 7 22:36:15 2014 +0200

    build: Bump GTK+ requirement
    
    ... for GTK_ICON_LOOKUP_DIR_{RTL,LTR}

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 6f30b6c..ca7f410 100644
--- a/configure.ac
+++ b/configure.ac
@@ -77,7 +77,7 @@ CLUTTER_MIN_VERSION=1.15.90
 GOBJECT_INTROSPECTION_MIN_VERSION=0.10.1
 GJS_MIN_VERSION=1.39.0
 MUTTER_MIN_VERSION=3.13.91
-GTK_MIN_VERSION=3.7.9
+GTK_MIN_VERSION=3.13.2
 GIO_MIN_VERSION=2.37.0
 LIBECAL_MIN_VERSION=3.5.3
 LIBEDATASERVER_MIN_VERSION=3.5.3