[issue45798] Move _decimal build setup into configure

[Ned Deily]

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


New changeset ddbab69b6d44085564a9b5022b96b002a52b2f2b by Ned Deily in branch 'main':
bpo-45798: Let libmpdec decide which archs to build on macOS as done previously. (GH-29949)
https://github.com/python/cpython/commit/ddbab69b6d44085564a9b5022b96b002a52b2f2b


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