What's new:
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- New APIs: getcontext, setcontext, makecontext, swapcontext.
- New functions: sigsetjmp, siglongjmp.
These were only available as macros up to now, but POSIX requires that
siglongjmp has to be available as function.
What changed:
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Bug Fixes
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- Fix potential hang running ldd(1).
Addresses: https://cygwin.com/ml/cygwin/2015-07/msg00292.html