message: Use correct rustc in rust's CI
diff: @@ -160,7 +160,9 @@ fn get_sysroot() -> PathBuf {
  }
  fn get_host() -> String {
  - let host = std::process::Command::new("rustc")
  + let rustc = rustc_test_suite().unwrap_or(PathBuf::from("rustc"));
  + println!("using rustc at {}", rustc.display());
  + let host = std::process::Command::new(rustc)
  .arg("-vV")
  .output()
  .expect("rustc not found for -vV")
  