[MacPorts] #45144: ghc: update to 7.8.3 and fix livecheck

[MacPorts]

#45144: ghc: update to 7.8.3 and fix livecheck
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 Reporter:  ryandesign@…  |      Owner:  kitchen.andy@…
     Type:  update        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  ghc
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 Please update ghc to 7.8.3; 7.6.3 does not build (#42091).

 Please fix the livecheck; the livecheck is currently disabled.

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Ticket URL: <https://trac.macports.org/ticket/45144>
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