For XCU5's sake, and due to popular demand, add link(8) and unlink(8)
utilities. This addresses PR standards/8027 by Giles Lean, who also submitted
a different implementation along with; I chose to

For XCU5's sake, and due to popular demand, add link(8) and unlink(8)
utilities. This addresses PR standards/8027 by Giles Lean, who also submitted
a different implementation along with; I chose to add those files I had written
a while ago for reasons of portability and not requiring being cleaned up wrt.
compile-time warnings.

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