What's new:
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What changed:
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Bug Fixes
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- Fix values returned by select(2) for shutdown sockets.
  Addresses: https://cygwin.com/pipermail/cygwin-developers/2021-April/012092.html

- Introduce a new hypotl(3) function not suffering unnecessary overflows.
  Addresses: https://cygwin.com/pipermail/cygwin/2021-April/248302.html

- Fix path handling for paths spanning native symlinks.
  Addresses: https://cygwin.com/pipermail/cygwin/2021-April/248307.html

- Fix tab position evaluation after console window resize.

- Fix a regression in pseudo console handling, resulting in rlwrap not
  being able to start a new pseudo console.

- Handle two race conditions in pseudo console usage.
  Addresses: https://cygwin.com/pipermail/cygwin/2021-April/248292.html

- Fix a bug in recognizing a successful completion of connect(2) on a
  datagram socket.

- Fix connect(2) when called with an address structure whose family is
  AF_UNSPEC.  As specified by POSIX and Linux, this is allowed on
  datagram sockets, and its effect is to reset the socket's peer
  address.