patch applied (cabal-install): Hide broken installed packages when resolving dependencies

[Duncan Coutts]

Tue May  6 17:21:03 PDT 2008  Duncan Coutts <duncan at haskell.org>
  * Hide broken installed packages when resolving dependencies
  Stops us from choosing them which would always end up with an
  invalid installation plan.

    M ./Hackage/Dependency.hs -3 +15

View patch online:
http://darcs.haskell.org/cabal-install/_darcs/patches/20080507002103-adfee-fe6a16e1b86696c96cbff99ee3c103ac5348f786.gz