[MacPorts] #41658: metis: Add gcc48 variant

[MacPorts]

#41658: metis: Add gcc48 variant
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  Reporter:  sylvain.desroziers@…  |      Owner:  macports-tickets@…
      Type:  enhancement           |     Status:  new
  Priority:  Normal                |  Milestone:
 Component:  ports                 |    Version:  2.2.1
Resolution:                        |   Keywords:  haspatch
      Port:  metis                 |
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Comment (by sean@…):

 Replying to [comment:1 ryandesign@…]:
 > Why would we want to add this? We don't usually add variants for random
 compilers.

 Being that metis is used in a lot of scientific codes, it is very valuable
 for having different compilers as variants (I did this as well with my
 "science ports"). Though, looking at the metis file, it seems all kinds of
 wrong having an openmpi variant (parmetis is the parallel version). I
 would like to unify all of these types of compilers but have been busy
 with other things :-/ I'll try to dig out some time to work on this.

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Ticket URL: <https://trac.macports.org/ticket/41658#comment:2>
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