[GHC] #11191: provide `make uninstall`

[GHC]

#11191: provide `make uninstall`
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        Reporter:  f-a               |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Build System      |              Version:
      Resolution:                    |             Keywords:  installation
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by thomie):

 * priority:  normal => low
 * component:  Compiler => Build System


Comment:

 This better wait till after the Shake rewrite of the build system, so we
 don't have to port it.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11191#comment:1>
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