RFR: 8291067: macOS should use O_CLOEXEC instead of FD_CLOEXEC [v3]

[Gerard Ziemski]

On Mon, 14 Nov 2022 21:06:22 GMT, Gerard Ziemski <gziemski at openjdk.org> wrote:

>> O_CLOEXEC is also available on macOS (__DARWIN_C_LEVEL >= 200809L), so use it same as on linux.
>
> Gerard Ziemski has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - remove comment, fix spacing
>  - test on all platforms except Windows

Thank you Dan, David and Thomas for your feedback!

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PR: https://git.openjdk.org/jdk/pull/9663