[gimp] app: add gimpoperationsettings.c to meson.build

[Ell <ell src gnome org>]

commit d25cddae8c10dbfcf78aea225a7d3d5b1345dbdd
Author: Ell <ell_se yahoo com>
Date:   Tue Apr 7 20:11:53 2020 +0300

    app: add gimpoperationsettings.c to meson.build

 app/operations/meson.build | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/app/operations/meson.build b/app/operations/meson.build
index aecc7228ed..8ffaf36bff 100644
--- a/app/operations/meson.build
+++ b/app/operations/meson.build
@@ -51,6 +51,7 @@ libappoperations_sources = [
   'gimpoperationscalarmultiply.c',
   'gimpoperationsemiflatten.c',
   'gimpoperationsetalpha.c',
+  'gimpoperationsettings.c',
   'gimpoperationshrink.c',
   'gimpoperationthreshold.c',
   'gimpoperationthresholdalpha.c',