patch applied (cabal): Allow addKnownProgram to be used as an update, not just insert

Wed Sep 17 15:58:56 PDT 2008 Duncan Coutts * Allow addKnownProgram to be used as an update, not just insert ie preserves any existing user-supplied path and args M ./Distribution/Simple/Program.hs -1 +2 View patch online: http://darcs.haskell.org/cabal/_darcs/patches/20080917225856-adfee-d2cb2f030...