[issue45798] Move _decimal build setup into configure

[Ned Deily]

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

The issue here turned out to be that the architecture selection code for libmpdec builds on macOS had been scrambled a bit on the move from setup.py to configure. To support universal builds correctly, libmpdec has code to decide itself which arch(s) to build with on macOS. PR 29949 restores that behavior and macOS universal2 builds (builds which have both native arm64 and x86_64 binaries in each executable or library file) now work again for 3.11.

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priority: release blocker -> 
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45798>
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