patch applied (cabal-branches/cabal-1.2): Fix pre-processing for executables

Sat Sep 22 03:54:14 PDT 2007 Duncan Coutts <duncan@haskell.org> * Fix pre-processing for executables The pre-processed files should go into the exe's build dir, not the lib's build dir. Also pre-process main modules, fixing bug #14. M ./Distribution/Simple/GHC.hs -1 +1 M ./Distribution/Simple/PreProcess.hs -2 +7