the file removal when deleting linkfarms if the expected file doesn't
exist. Since the symlink isn't there, the mission is already accomplished,
so why bother with the warning?
in this man page: depoted packages are kept in their depot directories, and
pkg_view(1) manages instances of those packages in views. Also copy the
warning in the pkg_delete(1) man page instead of the one from the
pkg_add(1) man page since the former correctly refers to package control
files already installed on the system.