[GHC] #1924: Rewrite the handling of values we get from ./configure

[GHC]

#1924: Rewrite the handling of values we get from ./configure
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    Reporter:  igloo         |       Owner:             
        Type:  bug           |      Status:  new        
    Priority:  high          |   Milestone:  6.10 branch
   Component:  Build System  |     Version:  6.8.1      
    Severity:  normal        |    Keywords:             
  Difficulty:  Unknown       |    Testcase:             
Architecture:  Unknown       |          Os:  Unknown    
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 The handling of values we get from configure needs to be rewritten to
 follow the normal conventions, and we should check that everything gets
 sane values (in particular, I'm not sure if mandir does currently). This
 was discussed in these messages and their replies:
 http://www.haskell.org/pipermail/cvs-ghc/2007-September/038407.html
 http://www.haskell.org/pipermail/cvs-ghc/2007-September/038418.html

 We should also only do this in a single file which is shared between
 normal builds and bindists, rather than doing it in both `mk/config.mk.in`
 and `distrib/Makefile-bin-vars.in`.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1924>
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