[MacPorts] #71310: Stop using xercesc3

[MacPorts]

#71310: Stop using xercesc3
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  Reporter:  ryandesign                          |      Owner:  (none)
      Type:  defect                              |     Status:  new
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:
Resolution:                                      |   Keywords:
      Port:  freecad cegui cegui libmemcached    |
  wt sigil-qt4 enigma gdal pcraster pdal h3dapi  |
  opensaml Gyoto aircraft_oap esmf geant4 nco    |
  sumo shibboleth xml-security-c xmltooling      |
  blahtexml xalanc xercesc3 xqilla zorba         |
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Comment (by ryandesign):

 Yes please! We don't want MacPorts to be a museum, but we also don't want
 to just remove a port that others still depend on, so it can take some
 work before an old library can be removed.

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Ticket URL: <https://trac.macports.org/ticket/71310#comment:2>
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