[GHC] #12552: Merge OpenBSD linking fix

[GHC]

#12552: Merge OpenBSD linking fix
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           Reporter:  bgamari        |             Owner:
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:  8.2.1
          Component:  Compiler       |           Version:  8.0.1
           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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 Merge f9aa996f0af59f32dc7b1528ff78be41413a9c27 to `ghc-8.0`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12552>
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