Merge branch 'win32-accommodate-funny-drive-names'

While the only permitted drive letters for physical drives on Windows
are letters of the US-English alphabet, this restriction does not apply
to virtual drives assigned via `subst <letter>: <path>`.

To prevent targeted attacks against systems where "funny" drive letters
such as `1` or `!` are assigned, let's handle them as regular drive
letters on Windows.

This fixes CVE-2019-1351.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
