patch applied (cabal-install): Try and pick up the http proxy on windows correctly

[Duncan Coutts]

Mon Jun 16 10:03:12 PDT 2008  Duncan Coutts <duncan at haskell.org>
  * Try and pick up the http proxy on windows correctly
  Takes account of the ProxyEnabled reg key
  Allow proxy uris that lack the http:// uri schema.
  This should really be moved into the HTTP package.

    M ./Hackage/HttpUtils.hs -20 +60

View patch online:
http://darcs.haskell.org/cabal-install/_darcs/patches/20080616170312-adfee-af689c15e2724748e36fe0133bb734c51697bf5d.gz