[Checkins] [zopefoundation/Persistence] c4b6e8: Try to fix the metaclass mess on Python 3.

[GitHub]

  Branch: refs/heads/py3-c-extension
  Home:   https://github.com/zopefoundation/Persistence
  Commit: c4b6e83c0a7c7b9550ecc2a7400dfa73f09d5011
      https://github.com/zopefoundation/Persistence/commit/c4b6e83c0a7c7b9550ecc2a7400dfa73f09d5011
  Author: Hanno Schlichting <hanno at hannosch.eu>
  Date:   2017-01-19 (Thu, 19 Jan 2017)

  Changed paths:
    M src/Persistence/mapping.py

  Log Message:
  -----------
  Try to fix the metaclass mess on Python 3.