[MacPorts] #40409: arpack: add gcc48 variant

[MacPorts]

#40409: arpack: add gcc48 variant
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  Reporter:  blair@…  |      Owner:  mmoll@…
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.2.0
Resolution:           |   Keywords:
      Port:  arpack   |
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Comment (by mmoll@…):

 Sure, go ahead.

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Ticket URL: <https://trac.macports.org/ticket/40409#comment:1>
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