[MacPorts] #39082: xml2: update to 0.5 and fix livecheck

[MacPorts]

#39082: xml2: update to 0.5 and fix livecheck
---------------------------+----------------------
  Reporter:  ryandesign@…  |      Owner:  cr@…
      Type:  update        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.1.3
Resolution:                |   Keywords:  haspatch
      Port:  xml2          |
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Comment (by cr@…):

 Thanks for the patch! The old xml2 worked so well I never bothered to
 update. I can confirm the patch works fine and the new build does what it
 is supposed to.

 Since there are no dependents, someone with commit rights should push 0.5
 out.

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Ticket URL: <https://trac.macports.org/ticket/39082#comment:2>
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