[MacPorts] #49267: atlas: add gcc5 variant and enable finding gfortran-mp-5

[MacPorts]

#49267: atlas: add gcc5 variant and enable finding gfortran-mp-5
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  Reporter:  sean@…       |      Owner:  vince@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch
      Port:  atlas        |
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Comment (by oyamada@…):

 These helped me very much. Thanks!

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Ticket URL: <https://trac.macports.org/ticket/49267#comment:2>
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