Log Message:
Update darkstat to 3.0.718.
per maintainer update request by PR pkg/49345.

v3.0.718 (25 January 2014)
 - (SECURITY!) Don't chroot() by default.  The user must specify
   a --chroot dir for this to happen now.
 - Bring back the "--base /path" functionality.
 - Add explicit warning about graphs being blank if we can't get
   local IPs on an interface.
 - Don't crash in timer_stop() if monotonic time stops or goes
   backwards.
 - Lots of internal cleanups.
 - Use time_t instead of "long" for time.  This is more correct
   and should fix darkstat on OpenBSD 5.5 on 32-bit systems.