Check for potential Unicode-related problems on Windows.
Change-Id: I147c07749c5073a9ae00f07914dd80347d17c40f
Ping-Bug: 15118
Reviewed-on: https://code.wireshark.org/review/31154
Tested-by: Petri Dish Buildbot
Petri-Dish: Peter Wu <peter@lekensteyn.nl>
Reviewed-by: Anders Broman <a.broman58@gmail.com>