Remove Windows-specific Data-files section
Remove Windows-specific Data-files section

This section is tripping up the other platforms while
building the build-source target; this section is not
used for the Windows build.  If there is some reason for
the hptool source tarball for Windows at some point,
we can revisit what has to be included here.

gbaz/haskell-platform,ardumont/haskell-platform,thomie/haskell-platform,ardumont/haskell-platform,bgamari/haskell-platform,erantapaa/haskell-platform,erantapaa/haskell-platform,erantapaa/haskell-platform,gbaz/haskell-platform,bgamari/haskell-platform