[MacPorts] #48636: xrootd: update to 4.2.2

[MacPorts]

#48636: xrootd: update to 4.2.2
--------------------------+----------------------
 Reporter:  ryandesign@…  |      Owner:  jonesc@…
     Type:  update        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  xrootd
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 Consider updating xrootd to the latest version, 4.2.2.

 http://xrootd.org/dload.html

 The livecheck also needs to be fixed.

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