[issue35523] Remove old ctypes callback workaround: creating the first instance of a callback

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

Ned Deily (Python 3.7 release manager): do you want an exception to backport a bugfix?

Campbell: Python 3.7 no longer accept bug fixes, only security fixes.
https://devguide.python.org/#status-of-python-branches

As I wrote previously, I'm not comfortable to make such change in a 3.7.x minor release, even if we didn't get any bug report since this change was done in Python 3.8.

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nosy: +ned.deily

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