Re-activate the nanosleep style using code, but with the signal handling

semantics of the old sleep for compatability with a few decades of expected
side effects.  Apache breaks if we just use nanosleep() for some reason,
here we use a new signanosleep() syscall which is kinda like a hybrid of
sigsuspend and nanosleep..

Reviewed by:  ache (and tested on his apache that was failing when
                    sleep used plain nanosleep)

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