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Use depinfo to discover UI test dependencies changelog: none context: https://rust-lang.zulipchat.com/#narrow/stream/257328-clippy/topic/Building.20test.20dependencies This restores [the old `EXTERN_FLAGS` method](https://github.com/rust-lang/rust-clippy/blob/4cf5bdc60c7ccec3b5f395ee393615c224e28555/tests/compile-test.rs#L67-L75) of passing `--extern` flags for building UI tests with minor changes - Unused deps were removed - It's now a `Vec` of args instead of a command string - It uses a `BTreeMap` so the extern flags are in alphabetical order and deterministic I don't know if the `HOST_LIBS` part is still required, but I figured it best to leave it in for now. If the change is accepted we can take a look if it's needed in `rust-lang/rust` after the next sync This isn't as pleasant as having a `Cargo.toml`, though there is something satisfying about knowing the dependencies are already built and not needing to invoke `cargo` r? `@flip1995`