[gnome-chess] Require GTK+ 3.12

[Michael Catanzaro <mcatanzaro src gnome org>]

commit d567309442f6ba2dbffa29dc8a3ced61dd5b34c6
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sun Apr 6 10:59:54 2014 -0500

    Require GTK+ 3.12
    
    We forgot to bump the GTK+ requirement when using GtkDialog's new
    use_header_bar property.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=727720

 configure.ac        |    2 +-
 data/preferences.ui |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index a4871df..2b7999b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -16,7 +16,7 @@ dnl ###########################################################################
 dnl Dependencies
 dnl ###########################################################################
 
-GTK_REQUIRED=3.10
+GTK_REQUIRED=3.12
 RSVG_REQUIRED=2.32.0
 
 PKG_CHECK_MODULES(GNOME_CHESS, [
diff --git a/data/preferences.ui b/data/preferences.ui
index f72dca7..7dd532d 100644
--- a/data/preferences.ui
+++ b/data/preferences.ui
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <interface>
-  <!-- interface-requires gtk+ 3.0 -->
+  <!-- interface-requires gtk+ 3.12 -->
   <object class="GtkListStore" id="custom_duration_units_model">
     <columns>
       <!-- column-name label -->