newlib/winsup/cygwin/release/2.12.0

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What's new:
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- Support for CLOCK_REALTIME_COARSE, CLOCK_MONOTONIC_COARSE,
CLOCK_MONOTONIC_RAW, CLOCK_BOOTTIME clocks.
- Support for case sensitive directories. mkdir(2) automatically
creates directories within the Cygwin installation dir as case
sensitive now.
This feature requires Windows 10 1803 or later and WSL installed!
- New file ioctls's FS_IOC_GETFLAGS and FS_IOC_SETFLAGS. The actual
inode flags are Cygwin-specific. This allows to set or reset
DOS attributes, file sparseness, FS level encryption and compression,
as well as directory case sensitivity programatically.
- New tools chattr(1) and lsattr(1) to utilize setting and viewing the
aforementioned new ioctl's on the command line.
- Support for exFAT.
- Support Linux-specific open(2) flag O_PATH.
- Support Linux-specific linkat(2) flag AT_EMPTY_PATH.
- Support overrun counter for posix timers (via timer_getoverrun() or
siginfo_t::si_overrun).
- New API: signalfd, timer_getoverrun.
What changed:
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- clock_nanosleep, pthread_condattr_setclock and timer_create now support
all clocks, except CLOCK_PROCESS_CPUTIME_ID and CLOCK_THREAD_CPUTIME_ID.
- clock_setres is a no-op now.
- Use the new POSIX unlink semantics on NTFS starting with Windows 10 1709.
Deleting an in-use file now actually removes the file, rather than moving
it to the recycler bin.
- Use the new POSIX rename semantics on NTFS starting with Windows 10 1809.
Renaming a file to another in-use file now actually removes the other file,
rather than moving it to the recycler bin.
- open(..., O_TMPFILE) now moves the file to the trash bin immediately,
to free the parent directory.
- Wctype functions updated to Unicode 11.0.
Bug Fixes
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- Fix a thread race when initializing CLOCK_MONOTONIC.
Addresses: https://cygwin.com/ml/cygwin/2018-11/msg00017.html
- Fix early timeout from pthread_cond_timedwait.
Addresses: https://cygwin.com/ml/cygwin/2018-11/msg00171.html
- Fix a bug in recognizing remote FAT/FAT32/exFAT correctly.
- Allow open(2)/stat(2)/linkat(2) of a file via /proc/PID/fd/DESCRIPTOR
even if file has been deleted.
Addresses: https://cygwin.com/ml/cygwin/2018-12/msg00125.html
https://cygwin.com/ml/cygwin/2018-12/msg00028.html
- Fix a bug in select(2) when polling HANDLE-less descriptors.
- Fix WEOF handling in wctype functions.
Addresses: https://cygwin.com/ml/cygwin/2018-12/msg00173.html