message: Use rustdoc-map even without the upstream cargo patch
diff: @@ -579,6 +579,12 @@ impl RustwideBuilder {
  // Add docs.rs specific arguments
  let mut cargo_args = Vec::new();
  + // Show the command line Rustdoc is invoked with
  + cargo_args.push("--verbose".into());
  + // We know that `metadata` unconditionally passes `-Z rustdoc-map`.
  + // Don't copy paste this, since that fact is not stable and may change in the future.
  + // Normally we would need -Z unstable-options, but we currently pass that too.
  + cargo_args.push(r#"--config=doc.extern-map.registries.crates-io="https://docs.rs""#.into());
  if let Some(cpu_limit) = self.config.build_cpu_limit {
  cargo_args.push(format!("-j{}", cpu_limit));
  }
  