Add radare2 package

packages/radare2.rb

+require 'package'
+
+class Radare2 < Package
+  description 'unix-like reverse engineering framework and commandline tools'
+  homepage 'http://www.radare.org/r/'
+  version '2.4.0'
+  source_url 'https://github.com/radare/radare2/archive/2.4.0.tar.gz'
+  source_sha256 'e2edef4d70c7bbbb47d04002ce9d384eb2fc9c0cd4cbfde77cda8c10cae9ff24'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+  depends_on 'openssl'
+
+  def self.build
+    system './configure',
+           "--prefix=#{CREW_PREFIX}",
+           "--libdir=#{CREW_LIB_PREFIX}",
+           '--with-openssl'
+    system 'make'
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end