[NETFILTER]: Remove unused file.

Signed-off-by: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>'

include/linux/netfilter_ipv6/ip6t_REJECT.h

-#ifndef _IP6T_REJECT_H
-#define _IP6T_REJECT_H
-
-enum ip6t_reject_with {
-	IP6T_ICMP_NET_UNREACHABLE,
-	IP6T_ICMP_HOST_UNREACHABLE,
-	IP6T_ICMP_PROT_UNREACHABLE,
-	IP6T_ICMP_PORT_UNREACHABLE,
-	IP6T_ICMP_ECHOREPLY
-};
-
-struct ip6t_reject_info {
-	enum ip6t_reject_with with;      /* reject type */
-};
-
-#endif /*_IPT_REJECT_H*/