Updated version of 5.04 installer available

Hi, should you run into linking problems when/if using the --mk-dll option to build DLLs with ghc-5.04 on a Windows box, a patched version of the 5.04 installer is now available which fixes the underlying problem. That's the only thing different wrt. the original 5.04 installer, so unless you're directly running into this problem, it's probably not worth your bandwidth to download the updated MSI. Thanks to Mark Tehver for reporting this. --sigbjorn