[C2hs] patch applied (c2hs): Add GNU C switch case range extension

[Duncan Coutts]

Sun Mar 25 05:24:01 PDT 2007  Duncan Coutts <duncan.coutts at worc.ox.ac.uk>
  * Add GNU C switch case range extension
  Allow switch cases like:
   'a' .. 'z' :

    M ./c2hs/c/CAST.hs +6
    M ./c2hs/c/CParser.y +4