message: Remove CACHEDIR.TAG as part of cargo clean
diff: @@ -175,6 +175,7 @@ pub fn clean(ws: &Workspace<'_>, opts: &CleanOptions<'_>) -> CargoResult<()> {
  // TODO: what to do about build_script_build?
  let incremental = layout.incremental().join(format!("{}-*", crate_name));
  rm_rf_glob(&incremental, config)?;
  + rm_rf(&uplift_dir.join("CACHEDIR.TAG"), config)?;
  }
  }
  }
  