env/windows: more network selection fixes
env/windows: more network selection fixes

Another addition of "--network=vpc" later in build.bash
in the image capture phase.

Updates golang/go#35006.

Change-Id: I5e23a693a6042f19a309d3fe7ddedba30e95cc1f
Reviewed-on: https://go-review.googlesource.com/c/build/+/406858
Reviewed-by: Carlos Amedee <ab5e2bca84933118bbc9d48ffaccce3bac4eeb64@golang.org>
Reviewed-by: Alex Rakoczy <60c6d277a8bd81de7fdde19201bf9c58a3df08f4@golang.org>

golang/build,golang/build,golang/build,golang/build