[issue35537] use os.posix_spawn in subprocess

[STINNER Victor]

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

"The native spawn(2) system introduced in Oracle Solaris 11.4 shares a lot of code with the forkx(2) and execve(2)."
https://blogs.oracle.com/solaris/posix_spawn-as-an-actual-system-call

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