Guillaume Gomez
201d567654
Fix alias path for rustdoc
I ran this command:
```console
x build --stage 1 --skip rustdoc
Building bootstrap
Compiling bootstrap v0.0.0 (/Users/yukang/rust/src/bootstrap)
Finished `dev` profile [unoptimized] target(s) in 1.08s
/Users/yukang/rust/build/aarch64-apple-darwin/ci-llvm/bin/llvm-strip does not exist; skipping copy
Building stage1 compiler artifacts (stage0 -> stage1, aarch64-apple-darwin)
Finished `release` profile [optimized + debuginfo] target(s) in 0.45s
Creating a sysroot for stage1 compiler (use `rustup toolchain link 'name' build/host/stage1`)
Building stage1 library artifacts{alloc, compiler_builtins, core, panic_abort, panic_unwind, proc_macro, rustc-std-workspace-core, std, std_detect, sysroot, test, unwind} (stage1 -> stage1, aarch64-apple-darwin)
Finished `dist` profile [optimized + debuginfo] target(s) in 0.10s
Skipping Set({build::src/tools/rustdoc}) because it is excluded
Building stage1 rustdoc_tool_binary (stage0 -> stage1, aarch64-apple-darwin)
Finished `release` profile [optimized + debuginfo] target(s) in 0.19s
```
expect all `rustdoc` related compiling phase will be exlcuded, but from the log we can see `rustdoc_tool_binary` is still compiled.
`src/tools/rustdoc` and `src/librustdoc` are documented as aliases in path set here:
https://github.com/rust-lang/rust/blob/a25435bcf7cfc9b953d356eda3a51db8da9e3386/src/bootstrap/src/core/builder/mod.rs#L355-L360
we can also see here two paths are treated as alias:
https://github.com/rust-lang/rust/blob/a25435bcf7cfc9b953d356eda3a51db8da9e3386/src/bootstrap/src/core/build_steps/check.rs#L818-L822
but bootstrap registered them as two different sets with `.path(..).path(...)`:
https://github.com/rust-lang/rust/blob/a25435bcf7cfc9b953d356eda3a51db8da9e3386/src/bootstrap/src/core/build_steps/tool.rs#L691-L693
That meant commands like `x build --skip rustdoc`, `--skip src/tools/rustdoc`, or `--skip src/librustdoc` only excluded one side.
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