22643032d4
Don't condition RUSTDOC_LIBDIR on `--no-doc` In d94e7ff065cd393a645eb3e9c96ce0418856e95d, `rustdoc_path` was changed to ignore `want_rustdoc` (which is just whether `--no-doc` was passed). But RUSTDOC_LIBDIR wasn't kept in sync. Rather than trying to keep `rustdoc_path` in sync with `RUSTDOC_LIBDIR`, just pass LIBDIR to the rustc shim unconditionally. This fix allows calling `ensure(doc::Step)` from a non-doc top-level Step, even if `--no-doc` was present in the command line.
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