[GHC] #11191: provide `make uninstall`

[GHC]

#11191: provide `make uninstall`
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           Reporter:  f-a            |             Owner:
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:
           Keywords:  installation   |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 As now there is no `make uninstall` for GHC.

 Even though most of the times this is not strictly needed, there are cases
 where this would be useful (a system with not much disk space available).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11191>
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