Log Message:
Use mk/fuse instead of filesytems/fuse.

NetBSD's FUSE implementation is part of the base system, and
filesytems/fuse is the user-space implementation for systems with the
/dev/fuse interface.  It might be possible to use filesytems/fuse and
perfused, but that's much harder than librefuse.

Now orifs runs on NetBSD 6.