[MacPorts] #52000: Add xz to "base" to allow changing the default compression format to .tar.xz in the future

[MacPorts]

#52000: Add xz to "base" to allow changing the default compression format to
.tar.xz in the future
-------------------------+--------------------------------
 Reporter:  mojca@…      |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  base         |    Version:  2.3.4
 Keywords:               |       Port:
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 It would be nice to add `xz` to base (in a similar way as it is done for
 Tcl) to be able to switch to `.tar.xz` in the future and to save space.

 (I don't want to open the can of worms discussing how to do the transition
 from `.tar.bz2` to `.tar.xz`, but merely to provide the prerequisite to be
 able to do so when we are ready.)

 `xz` and `xzdec` together need less than 300k in total (and perhaps a tiny
 bit more if built universally).

 (We could also build them just on 10.6 for x86_64 and 10.5 for i386/ppc
 and use the same binary everywhere.)

 Somewhat related tickets:
   * [[TicketQuery(id=33037|50448)]]

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Ticket URL: <https://trac.macports.org/ticket/52000>
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