Crater run for cargo build-dir changes

[ranger-ross]

PR for crater run of rust-lang/cargo#16336
Before running, we should probably get a sanity check from @epage that there is nothing I missed.

See Zulip Thread

r? @Mark-Simulacrum

[rustbot]

Some changes occurred in src/tools/cargo

cc @ehuss

[rustbot]

⚠️ Warning ⚠️

• Some commits in this PR modify submodules.

  If this was not intentional, see I changed a submodule on accident in the rustc dev guide.

[ehuss]

Do you happen to know the crater command you want to run? (The command syntax is documented at https://github.com/rust-lang/crater/blob/master/docs/bot-usage.md)

[Kivooeo]

Let's do try first and then run crater in check-only mode, at least this is how I understand this process

@bors try

[rust-bors]

⌛ Trying commit f5c22ed with merge 3117848…

To cancel the try build, run the command @bors try cancel.

Workflow: https://github.com/rust-lang/rust/actions/runs/20106890373

[ehuss]

@Kivooeo IIUC, that's not going to be sufficient for this because the new layout is not enabled by default. There may be some special settings like environment variables that will be needed to test this properly. And as for the mode, I suspect we want to build, not check, because we'll want to see if build scripts or proc-macros are doing any shenanigans that are required for linking correctly. (Or maybe test I don't know.)