patch applied (cabal): Improve an internal error message slightly

Sat May 30 13:55:40 PDT 2009 Duncan Coutts * Improve an internal error message slightly M ./Distribution/Simple/LocalBuildInfo.hs -4 +9 View patch online: http://darcs.haskell.org/cabal/_darcs/patches/20090530205540-adfee-24f74bbc3...