The current use of /tmp for file lists is insecure.  Put them under
$objtree/debian instead.
Signed-off-by: NBen Hutchings <ben@decadent.org.uk>
Cc: stable@vger.kernel.org  # 2.6.39+
Acked-by: Nmaximilian attems <max@stro.at>
Signed-off-by: NMichal Marek <mmarek@suse.cz>