[MacPorts] #41554: gsl: enable avx-optimized compilation

[MacPorts]

#41554: gsl: enable avx-optimized compilation
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  Reporter:  nicos@…      |      Owner:  dtakahashi42@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch
      Port:  gsl          |
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Comment (by dtakahashi42@…):

 Thank you very much nicos. This is just my preference, but I would like to
 add another compiler variant, namely mpclang33, rather than implicitly
 introducing a dependence on the macports' clang-3.3.

 Here, I attach my diff, so could you please give me any comments if you
 like.

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Ticket URL: <https://trac.macports.org/ticket/41554#comment:2>
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