Help needed testing automatic win64 configuration

[Brad Anderson]

Attempt four: http://gnuk.net/dmd-2.064-beta-newsc-lib64-4.exe

This one has a couple more changes to the dmd2beta.zip it is 
downloading from my server.

1. dmd.exe has been replaced with one built from 2.064 branch 
HEAD (so I didn't have to use LINKCMD64).
2. lib64 has been added and phobos64.lib and gcstub64.lib have 
been moved into there from lib.