stable branch - ports security updates

[albator]

Originally Posted by backrow

-current (and I believe 5.0) have pkg_delete -a:

     -a              Delete unused dependencies (packages that are not needed
                     by anything tagged as installed manually).  Can be used
                     without pkgnames.

Yes I am aware of this feature to come with 5.0 but I am still running stable.
At the moment, with pkg_info -t I can remove unneeded dependencies if I wish to do so.
But as I got big drives, it would be a waste to leave them empty :-)
Thanks anyway !