[MacPorts] #52606: atlas: add gcc6 variant.

[MacPorts]

#52606: atlas: add gcc6 variant.
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 Reporter:  mps@…        |      Owner:  vince@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.3.4
 Keywords:  haspatch     |       Port:  atlas
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 atlas currently does not have a gcc6 variant.

 As I was rebuilding my MacPorts under Sierra, I wanted to build octave
 with the atlas variant, using the same gcc6 compiler for atlas as for
 octave.

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Ticket URL: <https://trac.macports.org/ticket/52606>
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