newlib/winsup/cygwin/release/2.2.0

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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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- When started from a non-Cygwin process, check if $HOME starts with a
slash (absolute POSIX path). Otherwise ignore it.
Addresses: https://cygwin.com/ml/cygwin/2015-07/msg00344.html
Bug Fixes
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- Fix potential hang running ldd(1).
Addresses: https://cygwin.com/ml/cygwin/2015-07/msg00292.html
- Fix crashes under AllocationPreference=0x100000 condition
Addresses: https://cygwin.com/ml/cygwin/2015-02/msg00765.html
- x86_64 only: Implement memset, memmove, memcpy, wmemmove, wmemcpy in
assembler derived from NetBSD.
Addresses: https://cygwin.com/ml/cygwin-patches/2015-q3/msg00010.html