`makeWrapper` and `wrapProgram` are being invoked on all kinds of wacky things (usually with the help of bash globs or other machine assistance). So far, I have come across `wrapProgram` being invoked on a directory, as well as on the empty string. As far as I can tell, it's only valid to invoke these utilities on a normal (non-directory, non-device) executable file. This commit enforces that precondition.wip/yesman
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