Log Message:
4.1.8
================

FEATURES:
        - #732: tcp-mss, outgoing-tcp-mss options for nsd.conf.
        - #739: zonefile changes when mtime is small are detected on reload,
          if filesystem supports precision mtime values.
        - RR type CSYNC (RFC7477) syntax is supported.

BUG FIXES:
        - take advantage of arc4random_uniform if available.
        - 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.