hookup_moveoff.tcl: support twopass processing

by skipping pass0.

All signal, pin, loadrt and addf manipulations will then be
executed in pass1.

This works so long as the single (potentially multi-axis) moveoff
component is used and that component is installed by
hookup_moveoff.tcl itself.

Signed-off-by: Dewey Garrett <dgarrett@panix.com>