[evolution-data-server] Bump gtk+ version requirement to 3.10

[Milan Crha <mcrha src gnome org>]

commit a970a3dd9ac8355166a124728466b07876dc5a83
Author: Milan Crha <mcrha redhat com>
Date:   Tue Apr 7 15:32:46 2015 +0200

    Bump gtk+ version requirement to 3.10
    
    For gtk_info_bar_set_show_close_button(), which was introduced there.

 configure.ac |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 7e9b33b..b9cede5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -39,8 +39,8 @@ m4_define([glib_minimum_version], [2.40])
 m4_define([glib_encoded_version], [GLIB_VERSION_2_40])
 
 dnl Keep these two definitions in agreement.
-m4_define([gdk_minimum_version], [3.6])
-m4_define([gdk_encoded_version], [GDK_VERSION_3_6])
+m4_define([gdk_minimum_version], [3.10])
+m4_define([gdk_encoded_version], [GDK_VERSION_3_10])
 
 dnl Keep these two definitions in agreement.
 m4_define([soup_minimum_version], [2.42])