patch applied (cabal): Pass -no-user-package-conf to ghc when not using UserPackageDB

[Duncan Coutts]

Tue Jul 29 07:50:40 PDT 2008  Duncan Coutts <duncan at haskell.org>
  * Pass -no-user-package-conf to ghc when not using UserPackageDB
  Should eliminate the corner case where we're doing a global
  install but the user package db contains the exact same
  version as in the global package db. Perhaps we should warn
  in that case anyway since it's likely to go wrong later.

    M ./Distribution/Simple/GHC.hs -2 +4

View patch online:
http://darcs.haskell.org/cabal/_darcs/patches/20080729145040-adfee-63d429c4ca0987030999dd815b47cee17ab3e2be.gz