[gegl] gluas: opt out of autothreading

[Øyvind Kolås <ok src gnome org>]

commit dabdfc6f05dea1d1909be6f72c3da3f7a9fcc284
Author: Øyvind Kolås <pippin gimp org>
Date:   Thu Oct 12 00:46:26 2017 +0200

    gluas: opt out of autothreading

 operations/workshop/external/gluas.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/operations/workshop/external/gluas.c b/operations/workshop/external/gluas.c
index 92547a5..29d37af 100644
--- a/operations/workshop/external/gluas.c
+++ b/operations/workshop/external/gluas.c
@@ -985,6 +985,7 @@ gegl_op_class_init (GeglOpClass *klass)
 
   composer_class->process = process;
   operation_class->prepare = prepare;
+  operation_class->threaded = FALSE;
   operation_class->get_bounding_box = get_bounding_box;
   operation_class->get_required_for_output = get_required_for_output;