[issue25958] Implicit ABCs have no means of "anti-registration"

[Ivan Levkivskyi]

Ivan Levkivskyi added the comment:

On my machine 8 tests are always skipped:
    test_devpoll test_kqueue test_msilib test_ossaudiodev
    test_startfile test_winreg test_winsound test_zipfile64
All others tests pass OK.

The main part of the work is by Andrew Barnert, I only introduced small changes due to previous changes in Reversible and few minor things in response to previous comments.

Guido, thank you for applying the patch!

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