patch applied (packages/cabal-install): build-dep can now build the dependencies specified in a local .cabal file.

[bjorn at bringert.net]

Mon Apr  9 10:04:09 PDT 2007  bjorn at bringert.net
  * build-dep can now build the dependencies specified in a local .cabal file.
  This is useful when you want to build a development version of something whose dependencies are available in Hackage. 

    M ./src/Network/Hackage/CabalInstall/BuildDep.hs -2 +11
    M ./src/Network/Hackage/CabalInstall/Dependency.hs +1
    M ./src/Network/Hackage/CabalInstall/Main.hs -2 +5
    M ./src/Network/Hackage/CabalInstall/Setup.hs -1 +1