[tali] Bump Gtk+ required version to 3.15.0.

[Arnaud Bonatti <arnaudb src gnome org>]

commit 2c4cc26cc92b04e57c87ea2bace17a86abf2db34
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Sun Feb 22 20:15:40 2015 +0100

    Bump Gtk+ required version to 3.15.0.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index a0a70c3..4797b77 100644
--- a/configure.ac
+++ b/configure.ac
@@ -17,7 +17,7 @@ dnl ###########################################################################
 dnl Dependencies
 dnl ###########################################################################
 
-GTK_REQUIRED=3.12.0
+GTK_REQUIRED=3.15.0
 RSVG_REQUIRED=2.32.0
 
 PKG_CHECK_MODULES(TALI, [