message: minor 'override' fix
diff: @@ -32,7 +32,7 @@ namespace ospray {
  objectListeners[handleObjID] = listener;
  }
  - void incoming(const std::shared_ptr<maml::Message> &message)
  + void incoming(const std::shared_ptr<maml::Message> &message) override
  {
  auto obj = objectListeners.find(message->tag);
  if (obj != objectListeners.end()) {
  