[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 mark.brethen@…):

 After further testing this afternoon I have determined that element target
 size wasn't working. Add  patch-nglib-ng_vol.cpp.diff​ to files directory
 and revise portfile to include patch. This will need to be merged before
 the Calculix port, otherwise you will not be able to control element size
 when meshing with netgen.

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Ticket URL: <https://trac.macports.org/ticket/50687#comment:12>
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