patch applied (ghc): Don't hardwire the build path into the Haddock docs

[Sven Panne]

Tue Sep  4 10:28:55 PDT 2007  sven.panne at aedion.de
  * Don't hardwire the build path into the Haddock docs
  Formerly, the ghc-pkg was called to get the HTML dirs for other packages, but
  of course doing this at *build* time is totally wrong. Now we use a relative
  path, just like before. This is probably not perfect, but much better than
  before.
  
  As a sidenote: Cabal calls the relevant flag "html-location", ghc-pkg calls the
  field "haddock-html", and Haddock itself uses it as part of "read-interface".
  Too much creativity is sometimes a bad thing...

    M ./libraries/Makefile -1 +1