[issue45798] Move _decimal build setup into configure

[Ned Deily]

Ned Deily <nad at python.org> added the comment:

It looks like this change broke macOS universal2 builds of libmpdec. I'm looking at it now but wanted to flag it as a "release blocker" for tagging 3.11.0a3.

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nosy: +ned.deily
priority: normal -> release blocker
resolution: fixed -> 
stage: resolved -> 
status: closed -> open

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<https://bugs.python.org/issue45798>
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