message: Simplify target_config insert.
diff: @@ -700,12 +700,8 @@ impl<'cfg> RustcTargetData<'cfg> {
  if requested_kinds.iter().any(CompileKind::is_host) {
  let ct = CompileTarget::new(&rustc.host)?;
  target_info.insert(ct, host_info.clone());
  - if target_applies_to_host {
  - target_config.insert(ct, host_config.clone());
  - } else {
  target_config.insert(ct, config.target_cfg_triple(&rustc.host)?);
  };
  - };
  let mut res = RustcTargetData {
  rustc,
  