[clutter/clutter-1.18] Require GTK-Doc 1.20

[Emmanuele Bassi <ebassi src gnome org>]

commit f0ac5e176f7bc2a3ac9da37fdb213108a9c94442
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Mar 17 23:10:41 2014 +0000

    Require GTK-Doc 1.20
    
    We want the fancy new MarkDown parser.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 27e31c3..47b9b6d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -143,7 +143,7 @@ m4_define([cairo_req_version],          [1.12.0])
 m4_define([pango_req_version],          [1.30])
 m4_define([gi_req_version],             [0.9.5])
 m4_define([uprof_req_version],          [0.3])
-m4_define([gtk_doc_req_version],        [1.15])
+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([libinput_req_version],       [0.1.0])