[MacPorts] #53124: julia @0.4.6: Update to 0.6.0

[MacPorts]

#53124: julia @0.4.6: Update to 0.6.0
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  Reporter:  manuSrep  |      Owner:  seanfarley
      Type:  update    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  haspatch
      Port:  julia     |
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Comment (by seanfarley):

 I took a look at this patch over the weekend but it seems that the llvm
 story is still not ironed out in julia (they recommend building against a
 custom llvm 3.9 + their patches which I am very much unenthusiastic to
 do). I don't mind setting this llvm 4.0 and living with that. Perhaps
 [https://github.com/JuliaLang/julia/pull/26398 this] will be merged soon
 and we can just go straight to llvm 6.

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Ticket URL: <https://trac.macports.org/ticket/53124#comment:19>
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