[GHC] #9362: make clean deletes inplace mingw

[GHC]

#9362: make clean deletes inplace mingw
-------------------------------------+-------------------------------------
       Reporter:  niklasl            |                   Owner:
           Type:  bug                |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  Build System       |                 Version:  7.8.2
       Keywords:                     |        Operating System:  Windows
   Architecture:  Unknown/Multiple   |         Type of failure:  Building
     Difficulty:  Easy (less than 1  |  GHC failed
  hour)                              |               Test Case:
     Blocked By:                     |                Blocking:
Related Tickets:                     |  Differential Revisions:
-------------------------------------+-------------------------------------
 Running `make clean` removes the mingw toolchain from the inplace
 directory, forcing another `configure` before building is possible again.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9362>
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