newlib/winsup/cygwin/release/1.7.26

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What's new:
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What changed:
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- Slightly improve randomness of /dev/random emulation.
- Allow to use advisory locking on any device which is backed by an OS
handle. Right now this excludes /dev/clipboard, /dev/dsp, as well as
almost all virtual files under /proc.
Bug fixes:
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- pthread_atparent hook should not be called in the child.
Fixes: http://cygwin.com/ml/cygwin/2013-09/msg00365.html
- 64 bit only: Correctly mmap'ing regions > 4 Gigs.
Fixes: http://cygwin.com/ml/cygwin/2013-09/msg00155.html
- Fix random content of /proc/$PID/ctty if the process has no controlling
tty. Set to just "\n" instead.
- Properly set process sid rather than always using -1.
Fixes: http://cygwin.com/ml/cygwin/2013-10/threads.html#00237
- Fix a potential crash after calling lseek on /dev/clipboard.