bug#54667: 29.0.50; posix_spawn breaks emacs-gdb

[Robert Pluim]

>>>>> On Fri, 1 Apr 2022 15:29:50 +0200, "Herman, Géza" <geza.herman@gmail.com> 
>>>>> said:

    Herman> I can confirm that it fixes the problem.

Thanks, Iʼll see if I can get around to committing it this weekend.

    Herman> For reference, here's the patch:
    Herman> https://lists.gnu.org/archive/html/emacs-devel/2022-03/msg00067.html

    Herman> (Btw., according to this email thread, vfork is faster than
    Herman> posix_spawn on Linux, so maybe it'd make sense to use posix_spawn 
only
    Herman> on non-Linux platforms?)

In emacs-28 we only use posix_spawn on macOS because its vork is
sub-optimal. I donʼt remember the rationale for switching to using it
everywhere, itʼs undoubtedly in the archives somewhere.

Thanks

Robert
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