Add back set_binary_encoding.rb

[See rapid7#4875]

Author: Tod Beardsley

tools/dev/set_binary_encoding.rb

@@ -0,0 +1,28 @@
+#!/usr/bin/env ruby
+# -*- coding: binary -*-
+
+str = '# -*- coding: binary -*-'
+
+fname = ARGV.shift || exit
+data  = ''
+done  = nil
+fd = ::File.open(fname, "rb")
+fd.each_line do |line|
+  if line =~ /^#.*coding:.*/
+    done = true
+  end
+
+ 	if not done
+    unless line =~ /^#\!.*env ruby/
+      data << str + "\n"
+      done = true
+    end
+  end
+
+  data << line
+end
+fd.close
+
+fd = ::File.open(fname, "wb")
+fd.write(data)
+fd.close