Rollup merge of #95503 - jyn514:build-single-crate, r=Mark-Simulacrum
bootstrap: Allow building individual crates This aims to be as unintrusive as possible, but did still require adding a new `tail_args` field to all `Rustc` and `Std` steps. New library and compiler crates are added to the sysroot as they are built, since it's useful to have e.g. just alloc and not std. Fixes https://github.com/rust-lang/rust/issues/44293.
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