Move the declarations for dogetrusage(), itimerround(), and dowait4()

to sys/*.h headers so that the compat/linux code can use them.
Change dowait4() to not copyout() the status value, but rather leave
that for its caller, as compat/linux has to translate it, with the
side benefit of simplifying the native code.

Originally written months ago as part of the time_t work; long
memory, prodding, and ok from pirofti@

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