Make the portf symlink truly relative, to solve problem in which pax refuses to archive it because it points outside of tree.
Make the portf symlink truly relative, to solve problem in which pax refuses to archive it because it points outside of tree.

git-svn-id: 620571fa9b4bd0cbce9a0cf901e91ef896adbf27@19766 d073be05-634f-4543-b044-5fe20cf6d1d6

danchr/macports-base,macports/macports-base,neverpanic/macports-base,macports/macports-base,danchr/macports-base,neverpanic/macports-base