[MacPorts] #44810: gsl : Add gcc49 variant

[MacPorts]

#44810: gsl : Add gcc49 variant
--------------------------+--------------------------
  Reporter:  dixiao@…     |      Owner:  dtakahashi@…
      Type:  enhancement  |     Status:  closed
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:  fixed        |   Keywords:
      Port:  gsl          |
--------------------------+--------------------------
Changes (by dtakahashi@…):

 * status:  new => closed
 * resolution:   => fixed


Comment:

 As suggested by mf2k, the portfile migrated to the compiler portgroup,
 which supports gcc-4.9!

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Ticket URL: <https://trac.macports.org/ticket/44810#comment:5>
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