darcs patch: Make installPackage install setings from the [package].buildinfo file.

[Judah Jacobson]

* Make installPackage install settings from the [package].buildinfo file.

For libraries installed along with ghc, the settings from the
buildinfo file weren't being installed correctly.  In particular,
linking against the readline package didn't produce a necessary
"-lreadline" flag.

The problem was only with the installPackage script; Cabal's
"defaultMainWithHooks defaultUserHooks" handles buildinfo correctly.

  M ./libraries/installPackage.hs -1 +14
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