than separate ip_v and ip_hl members. Should have no effect on current code,
but I'd eventually like to get rid of those obnoxious bitfields completely.
Change IPTOS_PREC_ROUTINE to 0 (was conflict with IPTOS_LOWDELAY) according
to RFC 791 (unchanged since it) and BSDI 2.0 style
Submitted by: Igor Sviridov <siac@ua.net>