RFR: 8293122: (fs) Use file cloning in macOS version of Files::copy method [v4]

[Alan Bateman]

On Mon, 12 Sep 2022 16:22:39 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> Use BSD system call `clonefile` if possible when using `Files::copy` on macOS.
>
> Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8293122: Move rollback unlink to copyFile method

Marked as reviewed by alanb (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/10188