func_lpf_probe_parallel_nested tests UB?

[anyzelman]

See https://github.com/Algebraic-Programming/LPF/blob/master/tests/functional/func_lpf_probe_parallel_nested.c

This test in spmd2 communicates instances of lpf_machine_t and expects the copies to be useable.

According to the spec, however, e.g. for easy readability: http://albert-jan.yzelman.net/lpf/user/structlpf__machine__t.html , instances of lpf_machine_t shall not be communicated.

Should this test hence be deleted or was its main intent to test something else?

Crossref #26 where disabling it might be easiest