message: core: fix unused-parameter warning
diff: @@ -485,7 +485,7 @@ void SystemImpl::send_autopilot_version_request()
  auto fut = prom.get_future();
  send_autopilot_version_request_async(
  - [&prom](MavlinkCommandSender::Result result, float _val) { prom.set_value(result); });
  + [&prom](MavlinkCommandSender::Result result, float) { prom.set_value(result); });
  if (fut.get() == MavlinkCommandSender::Result::Unsupported) {
  _old_message_520_supported = false;
  @@ -531,7 +531,7 @@ void SystemImpl::send_flight_information_request()
  command.params.maybe_param1 = {static_cast<float>(MAVLINK_MSG_ID_FLIGHT_INFORMATION)};
  }
  - send_command_async(command, [&prom](MavlinkCommandSender::Result result, float _val) {
  + send_command_async(command, [&prom](MavlinkCommandSender::Result result, float) {
  prom.set_value(result);
  });
  if (fut.get() == MavlinkCommandSender::Result::Unsupported) {
  