[GHC] #7639: Fix installation issues with cross compiling + honour Stage1Only properly

[GHC]

#7639: Fix installation issues with cross compiling + honour Stage1Only properly
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  Reporter:  StephenBlackheath      |          Owner:                  
      Type:  bug                    |         Status:  closed          
  Priority:  normal                 |      Milestone:  7.8.1           
 Component:  Build System           |        Version:  7.7             
Resolution:  fixed                  |       Keywords:                  
        Os:  Unknown/Multiple       |   Architecture:  Unknown/Multiple
   Failure:  Installing GHC failed  |     Difficulty:  Unknown         
  Testcase:                         |      Blockedby:                  
  Blocking:  7610                   |        Related:                  
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Comment(by StephenBlackheath):

 Thanks. Will try out 'stage = 1' and add a note to the CrossCompiling wiki
 page if it does the trick.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7639#comment:8>
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