Build failure on OSX with --disable-atomic --enable-developer

Summary

BIND9 fails to build on OSX with --disable-atomic and --enable developer see output at: https://jenkins.isc.org/view/BIND/job/bind9-master-macmini--disable-atomic/513/console

Steps to reproduce

$ ./configure --disable-atomic --without-zlib --with-atf=/Users/jenkins/opt/atf --with-openssl=/usr/local/opt/openssl/ --with-libxml2=/usr/local/opt/libxml2 --enable-full-report --enable-developer $ make

What is the current bug behavior?

atomic_test.c:319:16: error: unused parameter 'tp' [-Werror,-Wunused-parameter] ATF_TP_ADD_TCS(tp) { ^ 1 error generated. make[3]: *** [atomic_test.o] Error 1

What is the expected correct behavior?

a successful build

Relevant configuration files

none

Relevant logs and/or screenshots

see https://jenkins.isc.org/view/BIND/job/bind9-master-macmini--disable-atomic/513/console

Possible fixes

we probably need an UNUSED(tp) on line 320 of atomic_test.c