[MacPorts] #53348: OpenBLAS*: redo compiler variants

[MacPorts]

#53348: OpenBLAS*: redo compiler variants
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  Reporter:  michaelld                 |      Owner:  NicosPavlov
      Type:  enhancement               |     Status:  new
  Priority:  Normal                    |  Milestone:
 Component:  ports                     |    Version:
Resolution:                            |   Keywords:
      Port:  OpenBlas, OpenBlas-devel  |
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Comment (by seanfarley):

 A few questions: how hard would it be to use the compilers portgroup
 directly? Follow-up, why not rename `+gcc6` to `+gfortran6` to explicitly
 mean only the fortran compiler from gcc?

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Ticket URL: <https://trac.macports.org/ticket/53348#comment:5>
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