[MacPorts] #54698: freecad: Switch to xercesc3

[MacPorts]

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

 Marked as blocking bug on macOS/MacPorts for FreeCAD:
 https://www.freecadweb.org/tracker/view.php?id=3172

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Ticket URL: <https://trac.macports.org/ticket/54698#comment:5>
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