patch applied (cabal-branches/cabal-1.2): Don't create empty data dirs. Fixes bug #153.

Wed Sep 12 04:38:03 PDT 2007 Duncan Coutts <duncan@haskell.org> * Don't create empty data dirs. Fixes bug #153. Patch contributed by Sven Panne. M ./Distribution/Simple/Install.hs -5 +2