[issue45847] Port module setup to PY_STDLIB_MOD() macro and addext()

[Erlend E. Aasland]

Change by Erlend E. Aasland <erlend.aasland at innova.no>:


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nosy: +erlendaasland

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45847>
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