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Add `std::os::unix::process::CommandExt::chroot` to safely chroot a child process This adds a `chroot` method to the `CommandExt` extension trait for the `Command` builder, to set a directory to chroot into. This will chroot the child process into that directory right before calling chdir for the `Command`'s working directory. To avoid allowing a process to have a working directory outside of the chroot, if the `Command` does not yet have a working directory set, `chroot` will set its working directory to "/". --- ACP: https://github.com/rust-lang/libs-team/issues/551 This PR currently has the tracking issue set to "none"; if the ACP is approved, I'll file a tracking issue and update the PR.