[GHC] #8943: Add System.Process.createPipe

[GHC]

#8943: Add System.Process.createPipe
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        Reporter:  tibbe              |            Owner:
            Type:  feature request    |           Status:  patch
        Priority:  normal             |        Milestone:  7.10.1
       Component:  libraries/process  |          Version:  7.6.3
      Resolution:                     |         Keywords:
Operating System:  Unknown/Multiple   |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown       |       Difficulty:  Unknown
       Test Case:                     |       Blocked By:
        Blocking:                     |  Related Tickets:
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Comment (by refold):

 I've attached an updated version of the patch that compiles for me on GHC
 7.6.3. Can I help with anything else (e.g. running tests)?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8943#comment:4>
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