Fix va_list define for FreeBSD, Linux and OpenBSD compat for splint.
Fix va_list define for FreeBSD, Linux and OpenBSD compat for splint.

binsys/unbound,LTD-Beget/unbound,binsys/unbound,LTD-Beget/unbound,binsys/unbound,LTD-Beget/unbound,LTD-Beget/unbound,binsys/unbound