[GHC] #14891: Cabal bump broke ext-interp tests on Darwin

[GHC]

#14891: Cabal bump broke ext-interp tests on Darwin
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           Reporter:  bgamari        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  highest        |         Milestone:  8.4.1
          Component:  Compiler       |           Version:  8.2.2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Since a9f680f631e2 the testsuite has been failing with
 [[https://phabricator.haskell.org/harbormaster/build/42193|broken ext-
 interp tests]] on Darwin. I also see this on the ghc-8.4 branch.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14891>
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