7388 Support DHCP Client FQDN. Allow IAID/DUID for all v4.

*** 18,27 ****
--- 18,28 ----
  #
  # CDDL HEADER END
  #
  #
  # Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
+ # Copyright (c) 2016, Chris Fraire <cfraire@me.com>.
  #
  
  #
  # MAPFILE HEADER START
  #
*** 102,111 ****
--- 103,113 ----
      global:
          isc_gethexstring;
          isc_puthexstring;
          __log_close_debug_channels;
          __memactive;
+         __ns_name_pton2;
          p_sockun;
          res_gethostbyname2;
          res_getservers;
          res_nametoclass;
          res_nametotype;