patch applied (cabal): Make the Compat/ReadP.hs cpp conditionals be opt-in rather than opt-out.

Wed Jan 23 12:16:44 PST 2008 Duncan Coutts * Make the Compat/ReadP.hs cpp conditionals be opt-in rather than opt-out. Previusly everyone got the compat version, except for ghc and hugs which opted out. Now just nhc98 opts in. M ./Distribution/Compat/ReadP.hs -2 +2