patch applied (packages/Cabal): Reduce the insanity in Configure

[Simon Marlow]

Mon Oct  5 04:09:57 PDT 2009  Duncan Coutts <duncan at haskell.org>
  * Reduce the insanity in Configure
  Ignore-this: 93fa0d351701e6317afb46df94e64777
  It was making so many different kinds of package index and converting
  back and forth between package id and installed package id that it
  made my brain hurt. Thou shalt not convert blithly between package Id
  and installed package Id for thou know not what thy doest.

    M ./Distribution/Simple/Configure.hs -95 +107

View patch online:
http://darcs.haskell.org/packages/Cabal/_darcs/patches/20091005110957-adfee-e0cceebbaf660565e10c7fa4ca99826557e2d302.gz