pgsql: Replace use of the long-deprecated Bonjour API

Log Message:
-----------
Replace use of the long-deprecated Bonjour API DNSServiceRegistrationCreate
with the not-so-deprecated DNSServiceRegister. This patch shouldn't change
any user-visible behavior, it just gets rid of a deprecation warning in
--with-bonjour builds. The new code will fail on OS X releases before 10.3,
but it seems unlikely that anyone will want to run Postgres 8.5 on 10.2.

Modified Files:
--------------
pgsql:
configure (r1.653 -> r1.654)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure?r1=1.653&r2=1.654)
configure.in (r1.609 -> r1.610)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure.in?r1=1.609&r2=1.610)
pgsql/src/backend/postmaster:
postmaster.c (r1.594 -> r1.595)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/postmaster.c?r1=1.594&r2=1.595)