[issue43060] Convert _decimal C API from pointer array to struct

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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nosy: +facundobatista, mark.dickinson, rhettinger, skrah

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43060>
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