[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 tibbe):

 simonmar added this info to the discussion thread:

 > I seem to remember that on Windows there are subtleties to do with
 whether the pipe ends are inheritable by subprocesses or not.  See
 mkAnonPipe() in the process package for how we deal with this already in
 process.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8943#comment:2>
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