net/samba425: restore missing FreeBSD mDNS/dns_sd support (MDNSRESPONDER)HEADmain

Same gap identified for net/samba424: three FreeBSD-local patches
providing dns_sd/mDNSResponder support (present identically in
net/samba419, 420, 422, and 423) were missing, gated behind the
non-default MDNSRESPONDER port option (default is AVAHI).

- source3/wscript/wscript_build: restore the --enable-dnssd waf
  option (dns_sd.h/DNSServiceRegister detection, WITH_DNSSD_SUPPORT
  define, dns_sd library linkage into smbd_base and smbclient).
  Regenerated against the real samba-4.25.0 upstream source (which
  has diverged from 4.24.7 in these two files, e.g. ceph rgw and
  rate-limiting daemon additions) rather than copied verbatim from
  samba424.
- source3/smbd/dnsregister.c: restore the FreeNAS-authored mDNS
  advertise-per-interface fixes. This file is byte-identical between
  4.24.7 and 4.25.0 upstream, so the samba424 patch applies verbatim.
- Makefile: MDNSRESPONDER_CONFIGURE_ENABLE=dnssd.

Verified by diffing the patch sets of samba419/420/422/423 against
samba425, and confirmed all three restored patches apply cleanly
(offset-only, no fuzz) against the real samba-4.25.0 upstream source.

PR:		299196 (comment 11 reported this gap on net/samba425)
PR:		299352
Approved by:	kiwi (samba team)

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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