[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:
 Keywords:          |       Port:  freecad
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 freecad should be updated to use xercesc3 instead of xercesc, which is
 obsolete and no longer maintained. Calling this a defect because it should
 be fixed. The xercesc will be removed soon.

 See #54168.

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