patch applied (ghc): Further tweaking of haddock doc installation

[Ian Lynagh]

Tue Sep 11 15:47:34 PDT 2007  Ian Lynagh <igloo at earth.li>
  * Further tweaking of haddock doc installation
  On Windows we now always use a path beginning $topdir/ so bindists are
  relocatable.
  
  We also now tell "Setup configure" where we are putting the
  documentation, and tell installPackage to override as little as
  possible.

    M ./libraries/Makefile -9 +29
    M ./libraries/installPackage.hs -6 +4