patch applied (cabal): Simplify getInstalledPackages and callers

[Duncan Coutts]

Wed Dec 23 15:48:57 PST 2009  Duncan Coutts <duncan at haskell.org>
  * Simplify getInstalledPackages and callers
  Ignore-this: 7927e992e0b040347dc24530219eb8eb
  No longer returns Maybe, we can find installed packages for all
  the compilers we support (and this feature is a requirement for
  support for new compilers).
  This is an API change so cannot merge to Cabal-1.8.x branch.

    M ./Distribution/Simple/Configure.hs -42 +17

View patch online:
http://darcs.haskell.org/cabal/_darcs/patches/20091223234857-adfee-fea716526361d03315104653b17d958e3759d7ed.gz