[GHC] #1863: gen-contents-index.sh doesn't work with Haddock 2

[GHC]

#1863: gen-contents-index.sh doesn't work with Haddock 2
--------------------------+-------------------------------------------------
 Reporter:  guest         |          Owner:          
     Type:  bug           |         Status:  new     
 Priority:  normal        |      Milestone:  6.8.2   
Component:  Build System  |        Version:  6.8.1   
 Severity:  normal        |       Keywords:  Haddock 
 Testcase:                |   Architecture:  Multiple
       Os:  Multiple      |  
--------------------------+-------------------------------------------------
 gen-contents-index.sh needs to pass -B <ghc-lib-dir> to Haddock if its
 version is >= 2.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1863>
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