patch applied (cabal): Make the datadir follow the $prefix on Windows

[Duncan Coutts]

Mon Dec 28 08:50:56 PST 2009  Duncan Coutts <duncan at haskell.org>
  * Make the datadir follow the $prefix on Windows
  Ignore-this: ce33a328dbf2d1e419cf6e5047bff091
  This is slightly experimental, we'll see how it goes. See ticket #466.

    M ./Distribution/Simple/InstallDirs.hs -5 +2

View patch online:
http://darcs.haskell.org/cabal/_darcs/patches/20091228165056-adfee-16ab1adef71a93bc106cf631d5090ae579550b0a.gz