Add package for ncat which is a 'netcat on steroids'

It has a bunch of extra features...  Binary package for x86_64 included

packages/ncat.rb

+require 'package'
+
+class Ncat < Package
+  description 'Ncat - Netcat for the 21st Century - a modern netcat with extra features from the makers of nmap.'
+  homepage 'https://nmap.org/ncat'
+  version '7.60'
+  source_url 'https://nmap.org/dist/nmap-7.60.tar.bz2'
+  source_sha256 'a8796ecc4fa6c38aad6139d9515dc8113023a82e9d787e5a5fb5fa1b05516f21'
+
+  binary_url ({
+    x86_64: 'https://www.clift.org/fred/chromebrew/ncat-7.60-chromeos-x86_64.tar.xz',
+  })
+  binary_sha256 ({
+    x86_64: '5660ea321436f1b9642d318a77e9b0b5c379825ac0611daaf5f82dd794753598',
+  })
+
+  depends_on 'buildessential' => :build
+  depends_on 'openssl' 
+  depends_on 'filecmd' => :build   #configure uses file 
+
+  def self.build
+    #fixup "/usr/bin/file" -> "/usr/local/bin/file" in the configure scripts
+    system "sed -i s#/usr/bin/file#/usr/local/bin/file#g libdnet-stripped/configure"
+    system "./configure"
+    system "cd ncat && make"
+  end
+
+  def self.install
+    system "cd ncat && make DESTDIR=#{CREW_DEST_DIR} install"
+  end
+end