[issue31370] Remove support for threads-less builds

[Antoine Pitrou]

New submission from Antoine Pitrou:

The --without-threads option has a lot of repercussions on the code base, forcing us to maintain specific paths for builds with threads disabled, for no useful purpose.

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components: Build, Interpreter Core
messages: 301518
nosy: gregory.p.smith, haypo, pitrou
priority: normal
severity: normal
stage: needs patch
status: open
title: Remove support for threads-less builds
type: enhancement
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue31370>
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