[GHC] #9549: deriveConstants fails on OpenBSD

[GHC]

#9549: deriveConstants fails on OpenBSD
-------------------------------------+-------------------------------------
              Reporter:  roland      |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  Build       |          Version:  7.9
  System                             |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:  OpenBSD     |       Difficulty:  Unknown
       Type of failure:  Building    |       Blocked By:
  GHC failed                         |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:  Phab:D332   |
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Comment (by roland):

 The above patch (Phab:D332) switches from nm to objdump if System.Info.os
 == "openbsd".  /usr/bin/objdump is part of the OpenBSD base system, so
 should always be there.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9549#comment:6>
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