[MacPorts] #46500: hs-parsec: update to 3.1.7

[MacPorts]

#46500: hs-parsec: update to 3.1.7
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  Reporter:  joelfred@…  |      Owner:  macports-tickets@…
      Type:  update      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.3
Resolution:              |   Keywords:  haspatch
      Port:  hs-parsec   |
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Comment (by joelfred@…):

 Not sure how to attach a diff, because this somehow points back to
 haskell-platform through magic I don't understand.

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Ticket URL: <https://trac.macports.org/ticket/46500#comment:2>
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