patch applied (cabal-install): Update the bootstrap script to work with ghc-6.12

[Duncan Coutts]

Fri Dec 18 08:52:34 PST 2009  Duncan Coutts <duncan at haskell.org>
  * Update the bootstrap script to work with ghc-6.12
  Ignore-this: b4aca31e814592f1cd6d53cf5a461859
  We can no longer expect mtl, network and parsec to be installed.

    M ./bootstrap.sh -12 +18

View patch online:
http://darcs.haskell.org/cabal-install/_darcs/patches/20091218165234-adfee-d92a04c4ddd3cf6745e45eb42c2e5346eb5ffe86.gz