[gegl] bump required babl to 0.1.30

[Øyvind Kolås <ok src gnome org>]

commit ce61121c0f27a69bc64595833e73bd1dee0988c6
Author: Øyvind Kolås <pippin gimp org>
Date:   Tue Aug 15 13:51:14 2017 +0200

    bump required babl to 0.1.30

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index b7547fc..54ad8de 100644
--- a/configure.ac
+++ b/configure.ac
@@ -37,7 +37,7 @@ m4_define([gegl_stable],
 m4_define([gimp_full_name], [Generic Graphical Library])
 
 # required versions of external libraries
-m4_define([babl_required_version], [0.1.26])
+m4_define([babl_required_version], [0.1.30])
 m4_define([cairo_required_version], [0.0.0])
 m4_define([gdk_pixbuf_required_version], [2.32.0])
 m4_define([introspection_required_version], [1.32.0])