[gegl] configure.ac: depend on babl-0.1.71

[Øyvind "pippin" Kolås <ok src gnome org>]

commit 9d1e254616fccced1b8d34b5a8273de24999c954
Author: Øyvind Kolås <pippin gimp org>
Date:   Mon Aug 12 17:52:15 2019 +0200

    configure.ac: depend on babl-0.1.71

 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/configure.ac b/configure.ac
index 6e42abd2a..05a712db5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -38,7 +38,7 @@ m4_define([gegl_stable],
 m4_define([gimp_full_name], [Generic Graphical Library])
 
 # required versions of external libraries
-m4_define([babl_required_version], [0.1.70])
+m4_define([babl_required_version], [0.1.71])
 m4_define([cairo_required_version], [1.12.2])
 m4_define([gdk_pixbuf_required_version], [2.32.0])
 m4_define([introspection_required_version], [1.32.0])