[Bug 209177] Update usr/bin/host to the latest upstream version to fix IXFR/AXFR handling

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209177

            Bug ID: 209177
           Summary: Update usr/bin/host to the latest upstream version to
                    fix IXFR/AXFR handling
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: vmagerya at gmail.com

Created attachment 169845
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=169845&action=edit
ldns-host-0289cde234a0.diff

Current usr/bin/host (coming from contrib/ldns-host and [1]) has two problems
with zone transfers:

1) IXFR queries are badly formed; for example:

    $ host -t ixfr x 127.0.0.1
    Using domain server:
    Name: 127.0.0.1
    Address: 127.0.0.1#53
    Aliases: 

    Host x not found: 1(FORMERR)

This FORMERR comes from the fact that 'host' adds two (instead of one) SOA
records to it's IXFR query packets; this started happening after contrib/ldns
updated to 1.6.17 due to changes in ldns (I can't tell you precisely which
FreeBSD versions ship with ldns 1.6.17 though).

2) Both AXFR and IXFR queries do not support multi-packets responses: 'host'
only print the first response packet. In practice this means any zone transfer
with zone sizes above 64kb will be silently truncated. While this problem is
documented in the man page, it's still unpleasant and I received reports from
people burned by it (they had to fix it by installing dns/bind-tools to revert
to the old 'host').

The latest upstream version of ldns-host [2] has both these problems fixed, and
I'm attaching a patch to update contrib/ldns-host to that. Ideally it should be
eventually imported into both current and stable branches.

[1] https://tx97.net/ldns-host/
[1] https://hg.tx97.net/ldns-host/file/0289cde234a0

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