[MacPorts] #71310: Stop using xercesc3

[MacPorts]

#71310: Stop using xercesc3
-------------------------+-------------------------------------------------
 Reporter:  ryandesign   |      Owner:  (none)
     Type:  defect       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 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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 [https://issues.apache.org/jira/browse/XERCESC-2257?focusedCommentId=17898273&page=com.atlassian.jira.plugin.system.issuetabpanels
 %3Acomment-tabpanel#comment-17898273 The developer of xercesc3 gives
 notice that it should not be used anymore]:

 > I'd strongly advise pulling or at least deprecating (don't know the
 official process) all the Macports relying on Xerces, they're all at risk
 using this code or Xalan. I am the last maintainer left, I don't support
 the Mac for my own software anymore, and once I'm fully off Xerces in a
 few years, I seriously doubt it has a future unless somethiing changes.
 >
 > Whatever the official process is for retiring ports, I would be getting
 the crank turning on that.

 Please try to remove the xercesc3 dependency from your ports. If it is a
 mandatory dependency, please work with the upstream developers to get it
 removed from their code.

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