SystemTools: Revert "Use copyfile(3) to clone files on macOS"
Revert commit 7c71e879 (SystemTools: Use copyfile(3) to clone files on macOS, 2019-03-05) because it changed the semantics of the copy operation w.r.t. the timestamp left on the new file. Further investigation is needed to use `copyfile` while preserving semantics.
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