Windows install to custom location after building from source

[Tim Golden]

Tim Golden wrote:
> However, the .msi installs (and Python
> runs) without issue on a virgin VirtualXP. And it passes the basic test 
> suite ok.

I lied. test_zipfile fails because the new(ish) zipdir.zip doesn't
get carried across to the install. Patched in:

  http://bugs.python.org/issue5470


A couple of other tests fail (test_platform & test_pep352) when
running regrest, but I can't get them to fail otherwise.


TJG