iptables: improve runit services.

If the rules files don't exist just return... this way the runsvdir log
is not cluttered with ENOENT messages.

srcpkgs/iptables/files/ip6tables/run

@@ -1,4 +1,4 @@
 #!/bin/sh
-set -e
+[ ! -e /etc/iptables/ip6tables.rules ] && return 0
 ip6tables-restore /etc/iptables/ip6tables.rules
 exec chpst -b ip6tables pause

srcpkgs/iptables/files/iptables/run

@@ -1,4 +1,4 @@
 #!/bin/sh
-set -e
+[ ! -e /etc/iptables/iptables.rules ] && return 0
 iptables-restore /etc/iptables/iptables.rules
 exec chpst -b iptables pause

srcpkgs/iptables/template

@@ -1,7 +1,7 @@
 # Template file for 'iptables'
 pkgname=iptables
 version=1.4.21
-revision=4
+revision=5
 build_style=gnu-configure
 build_options="systemd"
 configure_args="--enable-libipq --enable-shared --enable-devel --enable-bpf-compiler"
@@ -24,7 +24,6 @@ fi
 pre_build() {
 	rm include/linux/types.h
 }
-
 post_install() {
 	# systemd services.
 	if [ "$build_option_systemd" ]; then