patch applied (cabal): Display the appropriate install messages for lib vs exes

[Duncan Coutts]

Fri Aug 31 04:57:46 PDT 2007  Duncan Coutts <duncan at haskell.org>
  * Display the appropriate install messages for lib vs exes
  Don't confuse users by suggesting that we're installing libs when we're
  actually only installing exes, or vica-versa.

    M ./Distribution/PackageDescription.hs +4
    M ./Distribution/Simple/Install.hs -2 +5