[GHC] #3785: Broken link in library docs

[GHC]

#3785: Broken link in library docs
---------------------------------+------------------------------------------
    Reporter:  igloo             |        Owner:  igloo       
        Type:  bug               |       Status:  new         
    Priority:  high              |    Milestone:  6.12.2      
   Component:  Documentation     |      Version:  6.12.1      
    Keywords:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Testcase:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
---------------------------------+------------------------------------------
 We need to generate `libraries/prologue.txt` with the version number in
 the link now that packages include their version number.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3785>
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