[issue43422] Revert _decimal C API changes

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

skrah is still a bpo user with an CLA-signed account linked to his github account.  So he can post here and, I believe, open a PR as a contributor.  But if, under the current circumstances, he feels more comfortable using Antoine as a go between, then I thank Antoine for doing so.

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nosy: +terry.reedy

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