[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
 Keywords:           |       Port:  arpack
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 If arpack works with gfortran-mp-4.8, can a gcc48 variant be added and
 made the default?  Right now I'm maintaining gcc47 and gcc48 on the same
 box.

 I can do the commit if you give the OK.

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