Constant spam from unwinding routines makes +seh logs hard to read, especially
for programs that throw a lot of exceptions as part of normal execution. Since
unwind information is rarely useful, don't display it unless specifically
requested.

Make +unwind the default channel in these files, though, since there are more
unwind messages than exception messages.
Signed-off-by: Zebediah Figura <zfigura@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>