[issue23903] Generate PC/python3.def by scraping headers

[Zachary Ware]

Zachary Ware added the comment:

> There is a code for parsing preprocessor instructions in Argument Clinic.
> May be it can be reused here.

It already is, actually; its availability was a major factor in my thinking this would be possible and starting to work on it.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23903>
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