Update iptables from 1.6.1 to 1.8.3 (#3435)

Tested on ARM.

packages/iptables.rb

@@ -3,21 +3,13 @@ require 'package'
 class Iptables < Package
   description 'iptables is the userspace command line program used to configure the Linux 2.4.x and later packet filtering ruleset.'
   homepage 'https://www.netfilter.org/projects/iptables/'
-  version '1.6.1-1'
-  source_url 'https://www.netfilter.org/projects/iptables/files/iptables-1.6.1.tar.bz2'
-  source_sha256 '0fc2d7bd5d7be11311726466789d4c65fb4c8e096c9182b56ce97440864f0cf5'
+  version '1.8.3'
+  source_url 'https://www.netfilter.org/projects/iptables/files/iptables-1.8.3.tar.bz2'
+  source_sha256 'a23cac034181206b4545f4e7e730e76e08b5f3dd78771ba9645a6756de9cdd80'
 
   binary_url ({
-     x86_64: 'https://dl.bintray.com/chromebrew/chromebrew/iptables-1.6.1-1-chromeos-x86_64.tar.xz',
-    aarch64: 'https://dl.bintray.com/chromebrew/chromebrew/iptables-1.6.1-1-chromeos-armv7l.tar.xz',
-     armv7l: 'https://dl.bintray.com/chromebrew/chromebrew/iptables-1.6.1-1-chromeos-armv7l.tar.xz',
-       i686: 'https://dl.bintray.com/chromebrew/chromebrew/iptables-1.6.1-1-chromeos-i686.tar.xz',
   })
   binary_sha256 ({
-     x86_64: 'db40420fd3c926cf252232c19f4c07c35769ed2fa496350e88a4ff2a0422edee',
-    aarch64: '72c2d7c0c065ac6b4d3f98463e8accde960b67e9584c9c9a82043d71f5ef9dcd',
-     armv7l: '72c2d7c0c065ac6b4d3f98463e8accde960b67e9584c9c9a82043d71f5ef9dcd',
-       i686: '7c9eedcc3dd9e2657bdfbf0efcebe5e39762a36def97c3b531c93913c1ec29a0',
   })
 
   def self.build