[clutter] build: Bump gdk version requirement

[Olivier Fourdan <ofourdan src gnome org>]

commit 8076b09677a64ad0f5026faaf9b26b2dadd2f0e0
Author: Olivier Fourdan <ofourdan redhat com>
Date:   Thu Jan 5 09:04:04 2017 +0100

    build: Bump gdk version requirement
    
    gtk+-3.22.6 includes all the fixes required to use gdk subsurfaces under
    Wayland, bump the minimal required version to this new version.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=774546

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 6fc8ff9..f9c8288 100644
--- a/configure.ac
+++ b/configure.ac
@@ -142,7 +142,7 @@ m4_define([pango_req_version],          [1.30])
 m4_define([gi_req_version],             [1.39.0])
 m4_define([gtk_doc_req_version],        [1.20])
 m4_define([xcomposite_req_version],     [0.4])
-m4_define([gdk_req_version],            [3.3.18])
+m4_define([gdk_req_version],            [3.22.6])
 m4_define([libinput_req_version],       [0.19.0])
 m4_define([libudev_req_version],        [136])