[MacPorts] #52551: ghc: bump llvm dep

[MacPorts]

#52551: ghc: bump llvm dep
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 Reporter:  lists@…   |      Owner:  macports-tickets@…
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.3.4
 Keywords:  haspatch  |       Port:  ghc
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 This allows me to build on macOS sierra. No idea if this really is the
 'right' thing to do or not though.

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Ticket URL: <https://trac.macports.org/ticket/52551>
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