Add tcpflow package (#3571)

tcpflow is a TCP/IP packet demultiplexer. Tested on ARM.

packages/tcpflow.rb

+require 'package'
+
+class Tcpflow < Package
+  description 'TCP/IP packet demultiplexer'
+  homepage 'https://github.com/simsong/tcpflow'
+  version '1.5.0'
+  source_url 'https://github.com/simsong/tcpflow/releases/download/tcpflow-1.5.0/tcpflow-1.5.0.tar.gz'
+  source_sha256 '20abe3353a49a13dcde17ad318d839df6312aa6e958203ea710b37bede33d988'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+  depends_on 'boost'
+  depends_on 'cairo'
+  depends_on 'libpcap'
+
+  def self.build
+    system './configure',
+             "--prefix=#{CREW_PREFIX}",
+             "--libdir=#{CREW_LIB_PREFIX}"
+    system 'make'
+  end
+
+  def self.install
+    system 'make', "DESTDIR=#{CREW_DEST_DIR}", 'install'
+  end
+end