[MacPorts] #51439: ghc: allow building with clang-3.4 or later

[MacPorts]

#51439: ghc: allow building with clang-3.4 or later
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  Reporter:  mojca@…      |      Owner:  kitchen.andy@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  ghc          |
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Comment (by cal@…):

 I'm planning to switch this to llvm-3.7 for the next GHC upgrade.

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Ticket URL: <https://trac.macports.org/ticket/51439#comment:3>
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