[issue35823] Use vfork() in subprocess on Linux

[Alexey Izbyshev]

Change by Alexey Izbyshev <izbyshev at ispras.ru>:


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pull_requests: +21862
pull_request: https://github.com/python/cpython/pull/22944

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35823>
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