On windows the USERNAME often by default has a blank in it.

We need to either process the USERNAME to remove the blanks or create a sanity check
that reports that username cannot contain blanks.

Reported by peabody user:
> 7. Now, I passed the Sanity Checks, I got a build
> error that seemed to stem from my username again "My
> Name". It seems like the scripts don't like
> whitespace. So from the Window's environment
> variables. I manually changed:
>
> set USERNAME=MyName
###@###.### 2005-04-25 19:01:56 GMT