message: only check-build the dummy xargo project
diff: @@ -338,7 +338,7 @@ path = "lib.rs"
  let target = target.as_ref().unwrap_or(&host);
  // Now invoke xargo.
  let mut command = xargo_check();
  - command.arg("build").arg("-q");
  + command.arg("check").arg("-q");
  command.arg("--target").arg(target);
  command.current_dir(&dir);
  command.env("XARGO_HOME", &dir);
  