[Checkins] [zopefoundation/AccessControl] 719677: Drop a bit Python 2.3 support.

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/AccessControl
  Commit: 7196774f0947a51da3280e13b6d3c4770bcc8a04
      https://github.com/zopefoundation/AccessControl/commit/7196774f0947a51da3280e13b6d3c4770bcc8a04
  Author: Michael Howitz <mh at gocept.com>
  Date:   2017-05-17 (Wed, 17 May 2017)

  Changed paths:
    M src/AccessControl/ZopeGuards.py

  Log Message:
  -----------
  Drop a bit Python 2.3 support.