[gegl] build: require babl-0.1.64

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

commit 43ccfb3fda7c661f66e36ddf3d34cc51f4991e80
Author: Øyvind Kolås <pippin gimp org>
Date:   Sat May 25 19:07:02 2019 +0200

    build: require babl-0.1.64

 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/configure.ac b/configure.ac
index e7a98216d..abee94013 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], [0.1.63])
+m4_define([babl_required_version], [0.1.64])
 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])