[gimp] libgimpconfig: forgot to update gimpconfig.def AGAIN!

[Jehan <jehanp src gnome org>]

commit a411ee7c3857d29a63f0c0aff35200f32e14c7a4
Author: Jehan <jehan girinstud io>
Date:   Tue Jul 3 02:01:20 2018 +0200

    libgimpconfig: forgot to update gimpconfig.def AGAIN!
    
    Aaaaargh!

 libgimpconfig/gimpconfig.def | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/libgimpconfig/gimpconfig.def b/libgimpconfig/gimpconfig.def
index e8a098a712..21dd67de31 100644
--- a/libgimpconfig/gimpconfig.def
+++ b/libgimpconfig/gimpconfig.def
@@ -19,6 +19,7 @@ EXPORTS
        gimp_color_rendering_intent_get_type
        gimp_config_build_data_path
        gimp_config_build_plug_in_path
+       gimp_config_build_system_path
        gimp_config_build_writable_path
        gimp_config_copy
        gimp_config_deserialize