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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 "/".