[GHC] #12998: libraries/base/System/Posix/Types.hs: tries to define Floating instance for opaque type

[GHC]

#12998: libraries/base/System/Posix/Types.hs: tries to define Floating instance for
opaque type
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        Reporter:  slyfox            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #12795            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by DanielG):

 Ah looks like I trusted the assessments of `FPTOOLS_CHECK_HTYPE` a bit too
 much. Personally I'm not all that attached to `timer_t` specifically I
 just added it for completeness' sake. So I wouldn't mind just removing it.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12998#comment:4>
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