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Add chown functions to std::os::unix::fs to change the owner and group of files This is a straightforward wrapper that uses the existing helpers for C string handling and errno handling. Having this available is convenient for UNIX utility programs written in Rust, and avoids having to call unsafe functions like `libc::chown` directly and handle errors manually, in a program that may otherwise be entirely safe code. In addition, these functions provide a more Rustic interface by accepting appropriate traits and using `None` rather than `-1`.