[GHC] #878: Loading and unloading a Haskell DLL leaks handles

[GHC]

#878: Loading and unloading a Haskell DLL leaks handles
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    Reporter:  guest           |        Owner:             
        Type:  bug             |       Status:  new        
    Priority:  normal          |    Milestone:             
   Component:  Runtime System  |      Version:  6.4.2      
    Severity:  normal          |     Keywords:             
          Os:  Windows         |   Difficulty:  Easy (1 hr)
Architecture:  Unknown         |  
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When the ghc rts shuts down it does not free all Win32 handles.

 Here's a fix.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/878>
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