message: purge more rustwide stuff when it's not needed anymore
diff: @@ -73,6 +73,7 @@ impl RustwideBuilder {
  .command_timeout(COMMAND_TIMEOUT)
  .command_no_output_timeout(COMMAND_NO_OUTPUT_TIMEOUT)
  .init()?;
  + workspace.purge_all_build_dirs()?;
  let toolchain = Toolchain::Dist {
  name: "nightly".into(),
  @@ -180,6 +181,9 @@ impl RustwideBuilder {
  Ok(())
  })?;
  +
  + build_dir.purge()?;
  + krate.purge_from_cache(&self.workspace)?;
  Ok(())
  }
  @@ -304,6 +308,7 @@ impl RustwideBuilder {
  })?;
  build_dir.purge()?;
  + krate.purge_from_cache(&self.workspace)?;
  Ok(res.successful)
  }
  