winusb: unstable-2017-01-30 -> woeusb 3.1.4

WinUSB was renamed to WoeUSB
(https://github.com/slacka/WoeUSB/issues/100

).

Also, put mount points in /run instead of /tmp to sidestep security
considerations with /tmp.

Signed-off-by: Anders Kaseorg <andersk@mit.edu>