[issue35537] use os.posix_spawn in subprocess

[STINNER Victor]

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

See also:

"How a fix in Go 1.9 sped up our Gitaly service by 30x" (hint: posix_spawn)
https://about.gitlab.com/2018/01/23/how-a-fix-in-go-19-sped-up-our-gitaly-service-by-30x/

fork/exec vs. posix_spawn benchmarks:
https://github.com/rtomayko/posix-spawn#benchmarks

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<https://bugs.python.org/issue35537>
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