[NETFILTER]: net/ipv[46]/netfilter.c cleanups

Don't wrap entire file in #ifdef CONFIG_NETFILTER, remove a few
unneccessary includes.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/Makefile b/net/ipv6/Makefile
index 9601fd7..bf18cff 100644
--- a/net/ipv6/Makefile
+++ b/net/ipv6/Makefile
@@ -8,8 +8,7 @@
 		route.o ip6_fib.o ipv6_sockglue.o ndisc.o udp.o raw.o \
 		protocol.o icmp.o mcast.o reassembly.o tcp_ipv6.o \
 		exthdrs.o sysctl_net_ipv6.o datagram.o proc.o \
-		ip6_flowlabel.o ipv6_syms.o netfilter.o \
-		inet6_connection_sock.o
+		ip6_flowlabel.o ipv6_syms.o inet6_connection_sock.o
 
 ipv6-$(CONFIG_XFRM) += xfrm6_policy.o xfrm6_state.o xfrm6_input.o \
 	xfrm6_output.o
@@ -19,7 +18,7 @@
 obj-$(CONFIG_INET6_ESP) += esp6.o
 obj-$(CONFIG_INET6_IPCOMP) += ipcomp6.o
 obj-$(CONFIG_INET6_TUNNEL) += xfrm6_tunnel.o 
-obj-$(CONFIG_NETFILTER)	+= netfilter/
+obj-$(CONFIG_NETFILTER)	+= netfilter.o netfilter/
 
 obj-$(CONFIG_IPV6_TUNNEL) += ip6_tunnel.o