stoken/stoken-gui (new formula)

Signed-off-by: Alex Samorukov <samm@os2.kiev.ua>
[cernekee: update formula to work with stoken v0.8]
Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
openconnect: allow building --with-stoken
openconnect: update 7.01 bottle.
stoken: add 0.81 bottle.