[GHC] #13896: Use response file to invoke hsc2hs

[GHC]

#13896: Use response file to invoke hsc2hs
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        Reporter:  bgamari       |                Owner:  ckoparkar
            Type:  bug           |               Status:  patch
        Priority:  normal        |            Milestone:  8.6.1
       Component:  hsc2hs        |              Version:  8.0.1
      Resolution:                |             Keywords:  newcomer
Operating System:  Windows       |         Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown  |            Test Case:
      Blocked By:                |             Blocking:
 Related Tickets:                |  Differential Rev(s):  Phab:D4612
       Wiki Page:                |
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Comment (by ckoparkar):

 Step 2.2: https://github.com/haskell/haddock/pull/821

 Ryan Scott helped me fix the issue I was having while trying to build
 `haddock/ghc-head` on my local machine. I needed to pass `--allow-newer`
 to Cabal.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13896#comment:12>
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