What's new:
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What changed:
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Bug Fixes
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- Return ESPIPE rather than EINVAL from lseek on a fifo.
  Addresses: https://cygwin.com/ml/cygwin/2018-10/msg00019.html

- Fix a memory corruption when using pipes or FIFOs
  Addresses: https://cygwin.com/ml/cygwin-patches/2018-q4/msg00000.html

- Fix potential memory corruption and SEGV if socket(2), socketpair(2),
  accept(2), or accept4(2) fail.
  Addresses: https://cygwin.com/ml/cygwin/2018-10/msg00229.html

- Fix socket(2) and socketpair(2) calls mishandling SOCK_NONBLOCK and
  SOCK_CLOEXEC flags.
  Addresses: https://cygwin.com/ml/cygwin/2018-11/msg00017.html