[lightsoff] Bump gtk+ required version to 3.13.4.

[Arnaud Bonatti <arnaudb src gnome org>]

commit 58804071777db69f25c9398c03629256ce8cc8b6
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Sun Mar 29 10:21:23 2015 +0200

    Bump gtk+ required version to 3.13.4.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 463a9b9..06dffa7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -17,7 +17,7 @@ dnl ###########################################################################
 dnl Dependencies
 dnl ###########################################################################
 
-GTK_REQUIRED=3.13.2
+GTK_REQUIRED=3.13.4
 CLUTTER_REQUIRED=1.14.0
 CLUTTER_GTK_REQUIRED=1.5.0
 RSVG_REQUIRED=2.32.0