What's new:
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- New API: fls, flsl, flsll.


What changed:
-------------

Bug Fixes
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- Fix scandirat
  Addresses: https://cygwin.com/ml/cygwin/2017-07/msg00045.html

- Fix signal.h with strict features enabled
  Addresses: https://cygwin.com/ml/cygwin/2017-07/msg00051.html
  Addresses: https://cygwin.com/ml/cygwin/2017-07/msg00088.html