MFH: r532899

Backport r530401 | gerald | 2020-04-02 from our wine-devel companion:

Explicitly configure --without-unwind so that the presence of the
devel/libunwind port does not pull in an implicit dependency that
is not tracked properly.

Reported by: Andy Mender <andymenderunix@gmail.com>
PR: 245172
Approved by: portmgr (blanket: dependency issue)