[GHC] #2489: Registry keys are created in per-user HKCU instead of system-wide HKLM

[GHC]

#2489: Registry keys are created in per-user HKCU instead of system-wide HKLM
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    Reporter:  nimnul   |       Owner:         
        Type:  bug      |      Status:  new    
    Priority:  normal   |   Component:  None   
     Version:  6.8.3    |    Severity:  normal 
    Keywords:           |    Testcase:         
Architecture:  Unknown  |          Os:  Unknown
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 This bug is related to #1515. The installer shouldn't create any keys
 under HKCU, and should use system-wide HKLM instead.

 Now, the registry key is accessible only to the user who installed the
 GHC. Other users don't have the installation path in the registry, and
 this breaks all tools which rely on getting the installation path from the
 registry.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2489>
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