In delete_all_distfiles() when there is no $origin (such as when a port
has moved) but there IS a /var/db/ports/<portname>/distfiles, we do not
want to prompt the user if they are using -d, we just want to delete
the files.

In the code to strip a port from $build_l if the user chose not to
update a port that has an +IGNOREME file, the backslash in "\t" needs
to be escaped.