newlib-cygwin/winsup/cygwin/release/1.7.30

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What's new:
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- Introduce reading passwd/group entries directly from SAM/AD, thus allowing
to do without /etc/passwd and /etc/group files. Introduce /etc/nsswitch.conf
file to configure passwd/group handling.
What changed:
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- Windows defines the IPV6_TCLASS option, but when using it in setsockopt
it returns WSAENOPROTOOPT. Cygwin now ignores this error condition and
returns a fake success to the application, just as with IP_TOS for years.
Bug Fixes
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- Workaround a problem following native symlinks.
Fixes: http://cygwin.com/ml/cygwin/2014-04/msg00384.html
- Fix calls to readv/writev/recvmsg/sendmsg with 0 iovlen.
Fixes: http://cygwin.com/ml/cygwin/2014-04/msg00509.html