[GHC] #2023: Packages.lhs:mungePackagePaths doesn't handle haddock-html & haddock-interfaces

[GHC]

#2023: Packages.lhs:mungePackagePaths doesn't handle haddock-html & haddock-
interfaces
----------------------------+-----------------------------------------------
    Reporter:  guest        |       Owner:          
        Type:  bug          |      Status:  new     
    Priority:  normal       |   Milestone:  6.8.3   
   Component:  Compiler     |     Version:  6.8.2   
    Severity:  normal       |    Keywords:  packages
  Difficulty:  Easy (1 hr)  |    Testcase:          
Architecture:  Unknown      |          Os:  Unknown 
----------------------------+-----------------------------------------------
 Substitution for $topdir et al should be done for haddock-html and
 haddock-interfaces as well.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2023>
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