Adjust LD_LIBRARY_PATH for FreeBSD also; fallback to adjusting LD_LIBRARY_PATH when we don't know any better.

gtk config store pulled in libdl.so for us, so things fail
to link of the config store isn't enabled. This makes nsc
pull in libdl itself when its enabled.

forward a frame back to the wireless network only if the destination is associated, is a broadcast or multicast packet.