[GHC] #16083: tests relying on <iostream> are broken on Mojave builder

[GHC]

#16083: tests relying on <iostream> are broken on Mojave builder
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        Reporter:  bgamari       |                Owner:  (none)
            Type:  bug           |               Status:  new
        Priority:  normal        |            Milestone:
       Component:  Compiler      |              Version:  8.6.3
      Resolution:                |             Keywords:
Operating System:  MacOS X       |         Architecture:  x86_64 (amd64)
 Type of failure:  None/Unknown  |            Test Case:
      Blocked By:                |             Blocking:
 Related Tickets:                |  Differential Rev(s):
       Wiki Page:                |
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Comment (by carter):

 Hey Ben: have you tried running the tests explicitly with cc set to clang
 ?
 They’ve generally passed for me with clang

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16083#comment:4>
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