Win-GHC with GnuWin32 toolset--Mingw32 replacement

[Simon Marlow]

Peter Tanski wrote:
> The only other tools  
> required would be a Windows-native version of Readline--not because  
> ghci can't be built using the Mingw version but because the GHC  
> producing the Windows version will be using lib.exe to link.

Readline isn't necessary - we currently build GHCi without readline on Windows.

Cheers,
	Simon