[gegl] configure: depend on babl-0.1.66

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

commit 35bc6f695701fc52815d68b6d1560b783ea7e786
Author: Øyvind Kolås <pippin gimp org>
Date:   Wed Jun 12 20:09:18 2019 +0200

    configure: depend on babl-0.1.66

 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/configure.ac b/configure.ac
index abee94013..bfd9fe828 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], [0.1.64])
+m4_define([babl_required_version], [0.1.66])
 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])