prototype everything

prototype everything

SCCS-vsn: sys/netinet/tcp_debug.c 7.8
SCCS-vsn: sys/netinet/in.c 7.33
SCCS-vsn: sys/netinet/in_proto.c 7.12
SCCS-vsn: sys/netinet/in_pcb.h 7.9
SCCS-vsn: sys/netinet/tcp_usrreq.c 7.20
SCCS-vsn: sys/netinet/tcp_input.c 7.36
SCCS-vsn: sys/netinet/raw_ip.c 7.14
SCCS-vsn: sys/netinet/tcp_timer.c 7.22
SCCS-vsn: sys/netinet/ip_icmp.c 7.24
SCCS-vsn: sys/netinet/ip_var.h 7.12
SCCS-vsn: sys/netinet/in_cksum.c 7.6
SCCS-vsn: sys/netinet/tcp_subr.c 7.28
SCCS-vsn: sys/netinet/udp_usrreq.c 7.35
SCCS-vsn: sys/netinet/tcp_var.h 7.13
SCCS-vsn: sys/netinet/udp_var.h 7.12
SCCS-vsn: sys/netinet/ip_input.c 7.29
SCCS-vsn: sys/netinet/tcp_output.c 7.29
SCCS-vsn: sys/netinet/if_ether.c 7.28
SCCS-vsn: sys/netinet/in.h 7.15
SCCS-vsn: sys/netinet/ip_mroute.h 7.3