[Hackage] #219: JHC's generated .ho files should go under dist/

[Hackage]

#219: JHC's generated .ho files should go under dist/
----------------------------+-----------------------------------------------
  Reporter:  duncan         |        Owner:         
      Type:  defect         |       Status:  new    
  Priority:  low            |    Milestone:         
 Component:  Cabal library  |      Version:  1.2.3.0
  Severity:  minor          |     Keywords:         
Difficulty:  normal         |   Ghcversion:  6.8.2  
  Platform:  Linux          |  
----------------------------+-----------------------------------------------
 Apparently JHC puts `.ho` files into the src dirs.

 That will not work any more since we only clean the `dist/` directory.
 It's really much simpler that way.

 The fix is probably to pass some extra flag to jhc when compiling in
 `Distribution/Simple/JHC.hs`. Should be easy to fix for anyone who has a
 working jhc installed.

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Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/219>
Hackage <http://haskell.org/cabal/>
Hackage: Cabal and related projects