winsup/cygwin/release/3.1.6


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What changed:
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- Support more IPPROTO_TCP socket options: TCP_FASTOPEN, TCP_KEEPIDLE,
  TCP_KEEPCNT, TCP_KEEPINTVL, TCP_QUICKACK, TCP_USER_TIMEOUT.


Bug Fixes:
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- Fix IPPROTO_TCP option handling, especially in terms of TCP_MAXSEG.

- Fix a buffer overrun in Cygwin-internal string comparison.
  Fixes: https://cygwin.com/pipermail/cygwin/2020-June/245226.html