on-load
<PFE-SMART>
the goto-cpu feature will vanish. It had been used to create a
multi-forth in a non-threaded environment. This word
creates a number of CPU*-immediates that will switch the
QUIT-interpret loop to use the other cpu's dictionary.
reference: p4_load_cpus in ../src/yours.c:0357, export CX __cpus__