[gegl] configure.ac: require babl-0.1.61 or newer

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

commit 6996efd3952375d01c6ce3446e18b26784f35629
Author: Øyvind Kolås <pippin gimp org>
Date:   Sat Nov 24 03:42:48 2018 +0100

    configure.ac: require babl-0.1.61 or newer

 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/configure.ac b/configure.ac
index a98090902..785829ead 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], [0.1.58])
+m4_define([babl_required_version], [0.1.61])
 m4_define([cairo_required_version], [1.12.2])
 m4_define([exiv2_required_version], [0.25])
 m4_define([gdk_pixbuf_required_version], [2.32.0])