[Bug 233543] bsdtar: enable xz threads support

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233543

            Bug ID: 233543
           Summary: bsdtar: enable xz threads support
           Product: Base System
           Version: 12.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: shoesoft at gmx.net

Created attachment 199578
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=199578&action=edit
patch enabling xz threads support

Currently, bsdtar is built without XZ multi-threading support.

Can be tested with this command:
tar -Jcf /dev/null --options xz:threads=4 $HOME

After setting HAVE_LZMA_STREAM_ENCODER_MT, it works as expected, see attached
patch.

If this feature is enabled, the xz:threads option should also be mentioned in
the man page.

Either add a reference to -T option in xz(1) or duplicate the info from there:
> Specify the number of worker threads to use. Setting threads to
> a special value 0 makes xz use as many threads as there are CPU
> cores on the system.

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