[gegl] posterize: remove unused #define

[Øyvind Kolås <ok src gnome org>]

commit d2c9bc2f95c413735f52baf7e695ad86819c6e19
Author: Øyvind Kolås <pippin gimp org>
Date:   Thu Mar 30 00:04:44 2017 +0200

    posterize: remove unused #define

 operations/common/posterize.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/operations/common/posterize.c b/operations/common/posterize.c
index 22164fc..ff3bfa0 100644
--- a/operations/common/posterize.c
+++ b/operations/common/posterize.c
@@ -31,7 +31,6 @@ property_int  (levels, _("Levels"), 8)
 #define GEGL_OP_POINT_FILTER
 #define GEGL_OP_NAME     posterize
 #define GEGL_OP_C_SOURCE posterize.c
-#define GEGLV4
 
 #include "gegl-op.h"