[gdk-pixbuf] Bump gtk-doc dep to 1.20

[Matthias Clasen <matthiasc src gnome org>]

commit be07c552b4ffbf361c4986b7bace5694e8f5dc96
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Feb 17 16:55:47 2014 -0500

    Bump gtk-doc dep to 1.20

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 2ba175a..dbaaf65 100644
--- a/configure.ac
+++ b/configure.ac
@@ -978,7 +978,7 @@ GOBJECT_INTROSPECTION_CHECK([0.9.3])
 # Checks for gtk-doc and docbook-tools
 ##################################################
 
-GTK_DOC_CHECK([1.11], [--flavour=no-tmpl])
+GTK_DOC_CHECK([1.20], [--flavour=no-tmpl])
 
 AC_CHECK_PROG(DB2HTML, db2html, true, false)
 AM_CONDITIONAL(HAVE_DOCBOOK, $DB2HTML)