If I had to guess, I'd tend to think that those were old syscalls that became oxxx in 4.3 (or before), rather than from 4.3
In particular, the wait() syscall was made obsolete (replaced by a libc function which used wait3()) in about 4.1c or 4.2 BSD days (perhaps earlier - could have even been 4.0) - back then the old sys call would have been needed for the normal reason, but now they'd only be useful if you could find some really old (and obviously only vax) binaries to use them. kre
