[MacPorts] #59467: ghc @8.6.5_1: Built ghc not working on Catalina

[MacPorts]

#59467: ghc @8.6.5_1: Built ghc not working on Catalina
---------------------+-----------------------
  Reporter:  abusse  |      Owner:  essandess
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.6.2
Resolution:          |   Keywords:  catalina
      Port:  ghc     |
---------------------+-----------------------

Comment (by cjones051073):

 just use the `xcode_workaround` Portgroup

 https://github.com/macports/macports-
 ports/blob/master/_resources/port1.0/group/xcode_workaround-1.0.tcl

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Ticket URL: <https://trac.macports.org/ticket/59467#comment:18>
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