Features
========
* Fix#732: tcp-mss, outgoing-tcp-mss options for nsd.conf, patch from Daisuke Higashi.
* Fix#739: zonefile changes when mtime is small are detected on reload, if filesystem supports precision mtime values.
* RR type CSYNC (RFC7477) syntax is supported.
Bugfixes
========
* Change the nsd.db file version because of nanosecond precision fix.
* take advantage of arc4random_uniform if available, patch from Loganaden Velvindron.
* Fix flto check for OSX clang.
* Define _DEFAULT_SOURCE with _BSD_SOURCE for glibc 2.20 on Linux.
* Fix#736: segfault during zone transfer.
* Fix#744: Fix that NSD replies for configured but unloaded zone with SERVFAIL, not REFUSED.
The most complex problems were from dealing with switches reverted in
the meantime (gcc5, gmp6, ncurses6).
It's likely that darwin is (still) broken nontrivially.
Allowing to use nixpkgs config to provide different defaults is not
going to help us here, so we would like to use nsd.override {} in order
to supply the correct options in the module.
Eventually removing the nixpkgs config option would make sense here as
well.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
