newlib/winsup/cygwin/release/2.8.1

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What's new:
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- Allow unprivileged symlink creation in Windows 10 1703 and later.
- New API: reallocarray
- New API: strverscmp, versionsort.
What changed:
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- The XSI form of sigpause, which removes the given signal from the process's
signal mask, is made available when compiling with _XOPEN_SOURCE or
_GNU_SOURCE.
Bug Fixes
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- Fix build problem with GCC 6.
Addresses: https://cygwin.com/ml/cygwin-patches/2017-q2/msg00014.html
- Fix stat.st_blocks for files compressed with CompactOS method.
Addresses: https://cygwin.com/ml/cygwin-patches/2017-q2/msg00026.html
- Fix extreme lagging during strace in certain scenarios.
Addresses: https://cygwin.com/ml/cygwin/2017-04/msg00240.html
- Fix unwanted decimal point localization in /proc/loadavg
Addresses: Reported on IRC.
- Fix ldd potentially looping on non-continuable exception
Addresses: https://cygwin.com/ml/cygwin-patches/2017-q2/msg00002.html
- Fix buffer overflow problem in wcsxfrm/wcsxfrm_l.
Addresses: https://cygwin.com/ml/cygwin/2017-05/msg00149.html
- Fix crash if env var name starts with non-ASCII char
Addresses: https://cygwin.com/ml/cygwin/2017-05/msg00330.html
- Fix return value of lrint{f,l} on x86_64 Cygwin.
Addresses: https://cygwin.com/ml/cygwin/2017-05/msg00388.html
- Fix native language support in regtool(1).
Addresses: https://cygwin.com/ml/cygwin/2017-05/msg00245.html