[GHC] #8419: add rawSystem variant that takes an environment

[GHC]

#8419: add rawSystem variant that takes an environment
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       Reporter:  dagit              |             Owner:
           Type:  feature request    |            Status:  new
       Priority:  normal             |         Milestone:
      Component:  libraries/process  |           Version:  7.6.3
       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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 rawSystem properly handles the case of ^C while waiting. Instead of
 requiring people to recreate this behavior when using runProcess, it would
 be good if we add and export a rawSystemWithEnv or directly export
 syncProcess.

 See for example: https://github.com/haskell/cabal/issues/1448

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8419>
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