newlib/winsup/cygwin/release/1.7.23

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What's new:
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What changed:
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- Added CYGWIN environment variable keyword which causes the full windows
command line (<=32K) to always be sent to subprocesses.
See: http://cygwin.com/ml/cygwin/2013-07/threads.html#00523
Bug fixes:
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- Fix race condition in POSIX semaphores which potentially breaks fork() when
using POSIX semaphores in a multithreaded process.
Fixes: http://cygwin.com/ml/cygwin/2013-07/msg00404.html
http://cygwin.com/ml/cygwin/2013-07/msg00198.html
- Fix cyglsa build problem which made the cyglsa DLLs entirely non-functional
when built with newer gcc versions.
Fixes: http://cygwin.com/ml/cygwin/2013-07/msg00656.html
- Fix incorrect handling of /.. or //.. in parent path existence check.
Fixes: http://cygwin.com/ml/cygwin/2013-07/msg00689.html