[Checkins] [zopefoundation/Acquisition] 95a045: call PyObject_GC_UnTrack() in tp_dealloc()

[GitHub]

  Branch: refs/heads/issue21-backport-2.13
  Home:   https://github.com/zopefoundation/Acquisition
  Commit: 95a045df15bae95fa133b2f0e3c68d2f3d3459fb
      https://github.com/zopefoundation/Acquisition/commit/95a045df15bae95fa133b2f0e3c68d2f3d3459fb
  Author: KIMURA Chikahiro <chi-kimura at xr.jp.nec.com>
  Date:   2017-12-01 (Fri, 01 Dec 2017)

  Changed paths:
    M CHANGES.txt
    M src/Acquisition/_Acquisition.c

  Log Message:
  -----------
  call PyObject_GC_UnTrack() in tp_dealloc()

    see the following sites for details:
    * https://bugs.python.org/issue31095
    * https://github.com/python/cpython/pull/2974