[Checkins] [zopefoundation/AccessControl] 620401: Use `im_self` in C code.

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/AccessControl
  Commit: 620401be4327812aab11b6aef78d2742b8d55dca
      https://github.com/zopefoundation/AccessControl/commit/620401be4327812aab11b6aef78d2742b8d55dca
  Author: Hanno Schlichting <hanno at hannosch.eu>
  Date:   2017-02-01 (Wed, 01 Feb 2017)

  Changed paths:
    M include/ExtensionClass/ExtensionClass.h

  Log Message:
  -----------
  Use `im_self` in C code.