[GHC] #5195: Make dist-clean less stupid

[GHC]

#5195: Make dist-clean less stupid
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    Reporter:  ezyang            |       Owner:              
        Type:  bug               |      Status:  new         
    Priority:  normal            |   Component:  Build System
     Version:  7.1               |    Keywords:              
    Testcase:                    |   Blockedby:              
          Os:  Unknown/Multiple  |    Blocking:              
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown
---------------------------------+------------------------------------------
 It seems exceedingly odd that dist-clean will build a stage1 compiler if
 run on a checkout that was just cleaned.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5195>
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