[gegl] npd: opt out of threading

[Øyvind Kolås <ok src gnome org>]

commit ef613c848fab914729c583b6cc8878017838e27c
Author: Øyvind Kolås <pippin gimp org>
Date:   Thu Oct 12 00:35:02 2017 +0200

    npd: opt out of threading

 operations/external/npd.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/operations/external/npd.c b/operations/external/npd.c
index 3be6ca6..1c212c9 100644
--- a/operations/external/npd.c
+++ b/operations/external/npd.c
@@ -248,6 +248,7 @@ gegl_op_class_init (GeglOpClass *klass)
 
   filter_class->process    = process;
   operation_class->prepare = prepare;
+  operation_class->threaded = FALSE;
   G_OBJECT_CLASS (klass)->finalize = finalize;
 
   gegl_operation_class_set_keys (operation_class,