[MacPorts] #54698: freecad: Switch to xercesc3

[MacPorts]

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

Comment (by Schamschula):

 Configure will fail w/o xercesc:


 {{{
 -- Xerces-C was not found.
 CMake Error at CMakeLists.txt:614 (MESSAGE):
   ==================

   XercesC not found.

   ==================
 }}}

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Ticket URL: <https://trac.macports.org/ticket/54698#comment:2>
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