"warning: profiles for the non root package will be ignored" since clippy subtree update

[Zalathar]

As of #145749, invoking bootstrap now results in a bunch of unhelpful cargo warnings being printed to the console, multiple times:

$ x test coverage
Building bootstrap
    Finished `dev` profile [unoptimized] target(s) in 0.02s
warning: profiles for the non root package will be ignored, specify profiles at the workspace root:
package:   /Users/stuart/Dev/rust/rust/src/tools/clippy/Cargo.toml
workspace: /Users/stuart/Dev/rust/rust/Cargo.toml
Building stage1 compiler artifacts (stage0 -> stage1, aarch64-apple-darwin)
warning: profiles for the non root package will be ignored, specify profiles at the workspace root:
package:   /Users/stuart/Dev/rust/rust/src/tools/clippy/Cargo.toml
workspace: /Users/stuart/Dev/rust/rust/Cargo.toml
   Compiling rustc_trait_selection v0.0.0 (/Users/stuart/Dev/rust/rust/compiler/rustc_trait_selection)
[...]

[Kobzol]

Yeah, this will need to get changed on the Clippy side, I'm afraid.

[Zalathar]

According to rust-lang/rust-clippy#13408 (comment), the clippy maintainers have been deliberately withholding the relevant patch from subtree syncs (to avoid annoying us with this very warning), so it seems like something has gone amiss since then.

[Kobzol]

I don't think it was withheld from just syncs, because it wasn't on Clippy's master branch until recently, it was (re)-introduced in rust-lang/rust-clippy@90364dd, which looks a bit sus. Anyway, we'll just have to revert it from Clippy, I suppose.

[Kobzol]

Sent rust-lang/rust-clippy#15542.

[lqd]

We could land the change in this repo and it'll be picked up in the clippy repo on their next sync.

[Kobzol]

That's a better idea indeed. #145781