patch applied (packages/Cabal): Change default installation dirs for executables on Windows:

[Simon Marlow]

Tue Aug 22 06:42:32 PDT 2006  Simon Marlow <simonmar at microsoft.com>
  * Change default installation dirs for executables on Windows:
  
  before:
  
    bindir  = $prefix\$pkgid
    datadir = $prefix
  
  now:
  
    bindir  = $prefix\Haskell\bin
    datadir = $prefix\Haskell
  
  datasubdir is still $pkgid, so data files for an exectuable will be
  installed in $prefix\Haskell\$pkgid.
  
  the idea is that all executables are installed in the same directory
  by default, so setting PATH is easier.  Also, data files belonging to
  Haskell programs are grouped together under $prefix\Haskell.

    M ./Distribution/Simple/LocalBuildInfo.hs -2 +2
    M ./doc/Cabal.xml -2 +2