[mutter] clutter/configure.ac: Remove unused gdk dependency

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit fe7a67f0e7299befeafa957e168d138e4e1329e2
Author: Jonas Ådahl <jadahl gmail com>
Date:   Thu May 24 17:32:53 2018 +0200

    clutter/configure.ac: Remove unused gdk dependency

 clutter/configure.ac | 2 --
 1 file changed, 2 deletions(-)
---
diff --git a/clutter/configure.ac b/clutter/configure.ac
index 84beb35b4..fa20366cf 100644
--- a/clutter/configure.ac
+++ b/clutter/configure.ac
@@ -53,7 +53,6 @@ m4_define([cairo_req_version],          [1.14.0])
 m4_define([pango_req_version],          [1.30])
 m4_define([gi_req_version],             [1.39.0])
 m4_define([xcomposite_req_version],     [0.4])
-m4_define([gdk_req_version],            [3.3.18])
 m4_define([libinput_req_version],       [1.4.0])
 m4_define([libudev_req_version],        [136])
 m4_define([libwacom_req_version],       [0.13])
@@ -66,7 +65,6 @@ AC_SUBST([CAIRO_REQ_VERSION],      [cairo_req_version])
 AC_SUBST([PANGO_REQ_VERSION],      [pango_req_version])
 AC_SUBST([GI_REQ_VERSION],         [gi_req_version])
 AC_SUBST([XCOMPOSITE_REQ_VERSION], [xcomposite_req_version])
-AC_SUBST([GDK_REQ_VERSION],        [gdk_req_version])
 AC_SUBST([LIBINPUT_REQ_VERSION],   [libinput_req_version])
 AC_SUBST([LIBUDEV_REQ_VERSION],    [libudev_req_version])
 AC_SUBST([LIBWACOM_REQ_VERSION],   [libwacom_req_version])