Building juju-core on Windows

[David Cheney]

>> Certainly I would say we don't need >2GB of memory for Juju, but the
>> general go tool support seems better for 64-bit.
>
> The original problem was blown slightly out of proportion, but even
> then tip carries a precise GC these days, so 32-bit is no problem.

Even in Go 1.0 this isn't an issue. Really, it isn't. This is certainly 
not a problem for a 32bit juju cli binary.