[MacPorts] #50687: netgen @5.3.1 Add nglib and occ variants

[MacPorts]

#50687: netgen @5.3.1 Add nglib and occ variants
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  Reporter:  ian.rees@…   |      Owner:  sean@…
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch
      Port:  netgen       |
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Comment (by ian.rees@…):

 Do we need to get this merged before the Calculix ccx and cgx Port then?

 My personal goal is FEM working in FreeCAD for people who use MacPorts.
 For that use case, we need both ccx and nglib before we get FreeCAD FEM,
 but there's no dependency between ccx and nglib AFAICT.

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Ticket URL: <https://trac.macports.org/ticket/50687#comment:10>
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