newlib-cygwin/winsup/cygwin/release/3.1.4

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What changed:
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- 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).
- Allow AF_LOCAL sockets to be opened with O_PATH.
- <signal.h>: New macro _NSIG replacing NSIG. NSIG is now only
visible to MISC builds, as on Linux.
- The new locale modifier @cjksingle allows enforcing of single-width
character property for usually double-widthed characters. This will
be supported by upcoming mintty releases. For the reasoning, see
https://gitlab.freedesktop.org/terminal-wg/specifications/issues/9.
Bug Fixes:
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- Define CPU_SETSIZE, as on Linux.
Addresses: https://cygwin.com/ml/cygwin/2019-12/msg00248.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
- Many fixes in new pseudo console support.
Addresses (among others):
https://cygwin.com/ml/cygwin/2019-12/msg00173.html
https://cygwin.com/ml/cygwin/2019-12/msg00292.html
https://cygwin.com/ml/cygwin/2019-12/msg00295.html
https://cygwin.com/ml/cygwin/2020-01/msg00093.html
https://cygwin.com/ml/cygwin/2020-01/msg00147.html
https://cygwin.com/ml/cygwin/2020-01/msg00161.html