Add ndisc6 package (#2770)

packages/ndisc6.rb

+require 'package'
+
+class Ndisc6 < Package
+  description 'Small collection of useful tools for IPv6 networking (ndisc6, rdisc6, tcptraceroute6, traceroute6, rdnssd).'
+  homepage 'https://www.remlab.net/ndisc6/'
+  version '1.0.3'
+  source_url 'https://www.remlab.net/files/ndisc6/ndisc6-1.0.3.tar.bz2'
+  source_sha256 '0f41d6caf5f2edc1a12924956ae8b1d372e3b426bd7b11eed7d38bc974eec821'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+  
+  depends_on 'perl'
+
+  def self.build
+    system "./configure", "--prefix=#{CREW_PREFIX}", "--libdir=#{CREW_LIB_PREFIX}", "--disable-suid-install"
+    system "make"
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end