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4369396ce7
Fix rebuild issues with rustdoc. This fixes two issues related to rebuilds with rustdoc: * Switching features when running `cargo doc` would result in Cargo not rebuilding the documentation. This is because it was keeping the fingerprints in separate directories based on the features used. However, the rustdoc output isn't keyed off the metadata hash, so although the old fingerprint seemed "up to date", in reality the documentation was rewritten and needs to be rebuilt. The solution is to use a simplified hash for the fingerprint directory name. * Removing items does not remove the files from the doc directory. This changes it to clear the package's doc directory before running rustdoc, to ensure any stale files are removed. I'm a little concerned about potential performance impact of running `remove_dir_all`, but I think it shouldn't be too bad? Fixes #7370