[MacPorts] #54698: freecad: Switch to xercesc3

[MacPorts]

#54698: freecad: Switch to xercesc3
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  Reporter:  mf2k     |      Owner:  mark.brethen@…
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  freecad  |
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Comment (by mf2k):

 I don't even see a dependency for xercesc listed on their
 [https://www.freecadweb.org/wiki/CompileOnMac compiling for Mac wiki
 page]. Can we alter the portfile so it does not even need it?

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Ticket URL: <https://trac.macports.org/ticket/54698#comment:1>
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