particular, libmilter does *not* support "ldap", "sasl", etc. which are
supported by only sendmail. Do this through the following:
(1) Create libmilter/options.mk with support for the "inet6" option.
(2) Drop inclusion of options.mk from sendmail/Makefile.common and move
it to libmilter/Makefile and sendmail/Makefile.
While here, properly support IPv6 on FreeBSD, which like DragonFly has
getipnodebyname() in libc.
As a result of these changes, libmilter will no longer depend on
cyrus-sasl or openssl or openldap-client depending on what is set
in PKG_DEFAULT_OPTIONS.
Bump the PKGREVISION of libmilter to 1 due to the changed dependency list.
No change to sendmail as the binary package does not change.
