newlib/winsup/cygwin/release/1.7.21

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What's new:
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- New API: rawmemchr.
- Make cygcheck report when scanned DLLs are symlinks or are not meant
for the current architecture (x86 vs. x86_64).
See: http://cygwin.com/ml/cygwin/2013-07/msg00143.html
Bug fixes:
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- Fix long-standing problem which allows to access files via ".." using an
invalid POSIX path, for instance, `cd nonexistant/../existing_dir".
Fixes: http://cygwin.com/ml/cygwin/2013-05/msg00222.html
- Fix EFAULT when reading large clipboard.
Fixes: http://cygwin.com/ml/cygwin/2013-06/msg00311.html
- Fix creation of relative native symlinks.
Fixes: http://cygwin.com/ml/cygwin/2013-06/msg00340.html
http://cygwin.com/ml/cygwin/2013-07/msg00286.html
- Update profiling code to latest from Mingw-w64. Allows profiling on x86_64
now and fixes http://cygwin.com/ml/cygwin/2013-06/msg00376.html
- Fix character comparisons in certain scenarios within the functions glob(3),
fnmatch(3), and regcomp(3). All Unicode chars beyond U+0100 are affected.
- Fix problem with pty closing which manifested as a screen issue:
See: http://cygwin.com/ml/cygwin/2013-06/msg00196.html