[issue31370] Remove support for threads-less builds

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

This has unfortunately turned out to be a blocker on getting WASI support as there's not direct threading support in WebAssembly.

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nosy: +brett.cannon

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