[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
      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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Description changed by hvr:

Old description:

> 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

New description:

 `rawSystem` properly handles the case of `Ctl-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#comment:1>
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