When installation image is written on Windows, it automatically (by the
OS) gets mounted and Windows create "System Volume Information" there.
This obviously means the installation media is modified and then fails
verification.
This is really wrong from the Windows side to automatically modify some
files behind users back. But since we can prevent this with really low
cost by just creating those files ourself and reduce a lot of user
confusion, just do it.
Thanks @pbatard for the help.
FixesQubesOS/qubes-issues#2051
