patch applied (cabal-branches/cabal-1.2): Be more fuzzy with os, arch and impl matching in conditions. Fixes bug #158.

[Duncan Coutts]

Tue Sep 25 06:26:08 PDT 2007  Duncan Coutts <duncan at haskell.org>
  * Be more fuzzy with os, arch and impl matching in conditions. Fixes bug #158.
  Do all the comparisons case insensitively and add some OS aliases so that
  if os(windows)  works if the System.Info.os is actually "mingw32".

    M ./Distribution/Configuration.hs -3 +11