Don't build IPv6 support if NO_INET6 was defined
Don't build IPv6 support if NO_INET6 was defined

PR:		kern/73865
Submitted by:	Jeremy Chadwick <freebsd@jdc.parodius.com>
MFC after:	3 days

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase