patch applied (packages/Cabal): Get ghc, hsc2hs and cpphs programs more robustly in preprocessing

[Ian Lynagh]

Sun Apr 11 19:36:42 PDT 2010  Duncan Coutts <duncan at haskell.org>
  * Get ghc, hsc2hs and cpphs programs more robustly in preprocessing
  Avoid pattern match failure in obscure circumstances
  Should fix ticket #383

    M ./Distribution/Simple/PreProcess.hs -53 +61

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=packages/Cabal;a=darcs_commitdiff;h=20100412023642-adfee-c04c1f89fe633e30d0f102c86bca04c61ad7c98b.gz