Roken functions rk_copyhostent(), rk_freeaddrinfo(), rk_freehostent()
rk_getaddrinfo(), rk_getipnodebyaddr(), rk_getipnodebyname(), and
rk_getnameinfo() should never be built without the "rk_" prefix. Doing
so overrides the system provided functions of the same name when they
exist.