[MacPorts] #47077: version bump port xz

[MacPorts]

#47077: version bump port xz
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 Reporter:  dluke@…  |      Owner:  ryandesign@…
     Type:  update   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.3.3
 Keywords:           |       Port:  xz
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 upstream homepage says: 5.2.1 was released on 2015-02-26.

 Simple version bump compiles/destroots fine (I haven't tested it,
 otherwise I would have just pushed it as open maintainer).

 Patch attached.

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Ticket URL: <https://trac.macports.org/ticket/47077>
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