What's new:
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What changed:
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Bug Fixes
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- Fix timerfd select always returning immediately.
  Addresses: https://cygwin.com/ml/cygwin/2019-02/msg00364.html

- Fix fork/exec failing to restore timerfd share mem in child process.
  Addresses: https://cygwin.com/ml/cygwin/2019-02/msg00400.html

- Drop enforcing case-correct group names for AD accounts to avoid
  excessively long startup times.
  Addresses: https://cygwin.com/ml/cygwin/2019-02/msg00301.html

- Fix and speed up evaluation of group membership in seteuid.
  Addresses: Local testing.

- Fix getitimer/timer_gettime values returned for unarmed timer.
  Addresses: https://cygwin.com/ml/cygwin/2019-02/msg00395.html