i found the following in lib/libc/Makefile.  what is the status,
	and how should we clean these up?  iirc openbsd cleaned them up
	recently.

itojun


# indirect reference stubs, to be removed soon.
SRCS+=  _err.c _errx.c _sys_errlist.c _sys_nerr.c _sys_siglist.c \
	_sysconf.c _verr.c _verrx.c _vwarn.c _vwarnx.c _warn.c _warnx.c