Windows 2003 X64 and Windows 7 X64

[Kelly O'Hair]

I have been experimenting with using Windows 7 X64 for CYGWIN building rather than Windows 2003 X64.

I have no hard evidence yet, but it seems better. Anti-Virus conflict issues may  still be a problem.

It makes me think that maybe all this effort on Windows 2003 X64 build issues may be wasted, and maybe we
should consider just changing at least our 64bit builds to Windows 7 X64.

Both the old builds with MKS and the build-infra CYGWIN builds can work there with little to no change.

Thoughts?

-kto