Add iproute2

packages/iproute2.rb

+require 'package'
+
+class Iproute2 < Package
+  description 'Iproute2 is a collection of utilities for controlling TCP / IP networking and traffic control in Linux.'
+  homepage 'https://wiki.linuxfoundation.org/networking/iproute2'
+  version '4.12.0'
+  source_url 'https://www.kernel.org/pub/linux/utils/net/iproute2/iproute2-4.12.0.tar.xz'
+  source_sha256 '2e0a4c4262d9f6c169885a6e16c4c5c5f1ef6fd57b6a0e7b41f42be5bb6ebd7d'
+
+  def self.build
+    system "./configure --prefix=/usr/local"
+    system "make"
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end