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

[MacPorts]

#41554: gsl: enable avx-optimized compilation
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 Reporter:  nicos@…      |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:  haspatch     |       Port:  gsl
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 The latest apple's clang support now avx instructions, so that it should
 be now possible to compile GSL with avx optimisations. The attached patch
 should enable avx instructions in case of the optimize variant if a proper
 compiler is chosen.

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