[MacPorts] #49677: xrootd: update to 4.2.3

[MacPorts]

#49677: xrootd: update to 4.2.3
-----------------------+---------------------------------
  Reporter:  jonesc@…  |      Owner:  macports-tickets@…
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  haspatch maintainer
      Port:  xrootd    |
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Comment (by mojca@…):

 To Ryan: finding Python is controlled by a relatively complex script
 {{{
 /opt/local/share/cmake-3.4/Modules/FindPythonInterp.cmake
 }}}

 If MacPorts user doesn't have any Python installed, it picks the system-
 wide Python. Else it picks any Python >= 2.4, probably the latest one. If
 any suspicion is there, you should address it to the CMake developers (or
 the CMake port maintainer).

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Ticket URL: <https://trac.macports.org/ticket/49677#comment:9>
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