[master] Fixed compilation error when NSUPDATE is undefined

    Merge branch '16-a-nsupdate-compiling-issue-was-observed'

diff --cc RELNOTES
index 060919d3dd2abfabd91629e2c7f1b7e4aad6caea,bead852f71760a360de5cdfd208bbba708dfb914..5e4d517a7952ab1dd615af8d8a93c3be7400103e
--- 1/RELNOTES
--- 2/RELNOTES
+++ b/RELNOTES
@@@ -107,16 -107,12 +107,20 @@@ by Eric Young (eay@cryptsoft.com)
  - Bind9 now defaults to requiring python to build. The Makefile for
    building Bind9 when bundled with ISC DHCP was modified to turn off
    this dependency.
 -  [ISC-Bugs #3,!1   git #cc35f84943df44dac2499f3e16e8aaba7d54191d]
 +  [ISC-Bugs #3,!1     git cc35f84943df44dac2499f3e16e8aaba7d54191d]
 +
 +- Corrected a dual-stack mixed-mode issue that occurs when both
 +  ddns-guard-id-must-match and ddns-other-guard-is-dynamic
 +  are enabled and that caused the server to incorrectly interpret
 +  the presence of a guard record belonging to another client as
 +  a case of no guard record at all.  Thanks to Fernando Soto
 +  from BlueCat Networks for reporting this issue.
 +  [ISC-Bugs #1, !2    git 9ef78585440f568da2a2a0093a8c40c49118e292]
  
+ - Corrected a compilation issue that occurred when building without DNS
+   update ability (e.g. by undefining NSUPDATE).
+   [ISC-Bugs, #16,!9 git #TBD]
+ 
                Changes since 4.4.0 (New Features)
  - none
                Changes since 4.4.0 (Bug Fixes)