[GHC] #12154: GHC 8.0.1 x64 Windows installer doesn't honor custom install location

[GHC]

#12154: GHC 8.0.1 x64 Windows installer doesn't honor custom install location
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           Reporter:  scs            |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Package        |           Version:  8.0.1
  system                             |
           Keywords:                 |  Operating System:  Windows
       Architecture:  x86_64         |   Type of failure:  Installing GHC
  (amd64)                            |  failed
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 The GHC Windows installer has (thankfully!) the option for a preferred
 custom install location, in my case 'c:\devel\Haskell\8' (beside
 'c:\devel\Haskell\WinHugs' etc.) However, it obstinately installs into
 'c:\Program Files\Haskell Platform\yada yada...' The _uninstaller_
 operates with the custom location, and the uninstallation therefore fails.

 Potential triggers: disallowing the installer to muck with the environment
 path and registry (I set these myself, thank you very much).

 Workaround: GHC is thankfully still self contained, and moving the
 installation to the preferred location suffices.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12154>
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