patch applied (cabal): Add Text instances for OS and Arch

[Duncan Coutts]

Thu Mar 20 21:12:55 PDT 2008  Duncan Coutts <duncan at haskell.org>
  * Add Text instances for OS and Arch

    M ./Distribution/PackageDescription.hs -3 +3
    M ./Distribution/PackageDescription/Configuration.hs -5 +5
    M ./Distribution/System.hs -19 +25

View patch online:

  http://darcs.haskell.org/cabal/_darcs/patches/20080321041255-adfee-3bfa2f11ff14a0bff65da944b0490a8a80f98122.gz