[issue35537] use os.posix_spawn in subprocess

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

I wrote PR 11668 to propose to *document* the subtle behavior change when posix_spawn() is used on QEMU User Emulation and WSL platforms, rather than trying to opt-out for posix_spawn() on these platforms.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35537>
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