[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:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.3.4
 Keywords:          |       Port:
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 Previously, atlas couldn't find gfortran-mp-5 because it was looking for
 gfortran-mp-4.x. This fixes that behavior and also adds a gcc5 variant.

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