Fix hack for test --stage 0 --doc std #98728
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In #95993 I added a hack to bootstrap that special-cased sysroot handling for doctests. Since rust-lang/cargo#10560 has been merged, we can remove the hack - I think just reverting the PR should still work, although you should test locally.
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Category: PRs that clean code up or issues documenting cleanup.Call for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue.Call for participation: This issue has a mentor. Use #t-compiler/help on Zulip for discussion.Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)