RFR: 8274293: Build failure on macOS with Xcode 13.0 as vfork is deprecated [v2]

[Thomas Stuefe]

On Sat, 25 Sep 2021 01:48:29 GMT, xpbob <github.com+7837910+xpbob at openjdk.org> wrote:

>> remove vfork() on Darwin
>
> xpbob has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Drop drop "Solaris" from the comment

.. I opened https://bugs.openjdk.java.net/browse/JDK-8274320 to track the proposed change of os::fork_and_exec() to posix_spawn. So I am fine with this change.

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Marked as reviewed by stuefe (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/5686