What's new:
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What changed:
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Bug Fixes
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- Fix strxfrm/wcsxfrm return value if output buffer is too small.  Fix
  wcsxfrm return value either way.
  Addresses: https://cygwin.com/ml/cygwin/2016-04/msg00232.html

- Fix bug introduced in 2.5.0: Fix condition specifying when to write a
  NULL SID ACE.
  Addresses: https://cygwin.com/ml/cygwin/2016-04/msg00400.html

- Remove spurious checks for already initialized pthread object in pthread
  object init functions.
  Addresses: https://cygwin.com/ml/cygwin/2016-04/msg00473.html