Make copy_binaries compatible with lddtree from pax-utils-0.6

On some system the output from the new lddtree does not match with what
genkernel expects, however lddtree have insted gained a new option that
essentially gives what we want with less code.

Signed-off-by: Peter Hjalmarsson <xake@rymdraket.net>
Unify copy_binaries() more

As suggested by Vapier in bug #450688.

Signed-off-by: Peter Hjalmarsson <xake@rymdraket.net>