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

- Allow symlinks to be opened with O_PATH | O_NOFOLLOW.

- Allow the pathname argument to readlinkat(2) to be an empty string,
  provided the dirfd argument refers to a symlink opened with
  O_PATH | O_NOFOLLOW.  The readlinkat call then operates on that
  symlink.

- Support the Linux-specific AT_EMPTY_PATH flag for fchownat(2) and
  fstatat(2).

Bug Fixes:
----------

- Define CPU_SETSIZE, as on Linux.
  Addresses: https://cygwin.com/ml/cygwin/2019-12/msg00248.html

- Fix the problem which overrides the code page setting.
  Addresses: https://www.cygwin.com/ml/cygwin/2019-12/msg00292.html

- Fix a regression that prevented the root of a drive from being the
  Cygwin installation root.
  Addresses: https://cygwin.com/ml/cygwin/2020-01/msg00111.html