[MacPorts] #48636: xrootd: update to 4.2.2

[MacPorts]

#48636: xrootd: update to 4.2.2
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  Reporter:  ryandesign@…  |      Owner:  jonesc@…
      Type:  update        |     Status:  closed
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:  fixed         |   Keywords:
      Port:  xrootd        |
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Comment (by mojca@…):

 Livecheck added in r143657. Feel free to correct it in case it's
 unreliable.

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Ticket URL: <https://trac.macports.org/ticket/48636#comment:5>
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