bug#29235: Builtin bsdtar decompression for .tar.xz not used

[Robert Pluim]

>>>>> On Fri, 03 Sep 2021 12:45:52 +0200, Lars Ingebrigtsen <larsi@gnus.org> 
>>>>> said:

    Lars> Andreas Schwab <schwab@linux-m68k.org> writes:
    >> On Sep 03 2021, Lars Ingebrigtsen wrote:
    >> 
    >>> +    ,(if (featurep 'ns)
    >>> +         ["\\.xz\\'"
    >>> +          "XZ compressing"     "gzip"           ("-c" "-q")
    >> 
    >> Don't you need to tell gzip to produce XZ format instead of GZIP?

    Lars> I don't know -- that's why I asked:

    >> So would the following change make sense, or do we need more parameters
    >> in the compressing case to make Macos gzip make an .xz archive?

>From 'man gzip' on a mac:

    This version of gzip is also capable of decompressing files compressed
    using compress(1), bzip2(1), or xz(1).

So I think people need to install xz if they want to create xz format
archives.

Robert
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