[MacPorts] #55847: freecad: Update to 0.16.6712

[MacPorts]

#55847: freecad: Update to 0.16.6712
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  Reporter:  ryandesign  |      Owner:  mark.brethen@…
      Type:  update      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  freecad     |
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Comment (by ryandesign):

 That's simple enough to fix. They're checking whether a pointer
 (`aFileId`) is less than zero. Pointers shouldn't be compared in that way.
 It should instead be checked whether the pointer is `nil`.

 A change to this code was already
 [https://github.com/FreeCAD/FreeCAD/commit/666a3e5a6850264da5048b0a257a1bc591ce5780
 committed] but I haven't tested whether it fixes the problem.

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Ticket URL: <https://trac.macports.org/ticket/55847#comment:3>
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