make rails 1.2.x work with Ruby >= 1.8.7

rails_1.2_ruby_1.8.7.rb

# make rails 1.2.x work with Ruby >= 1.8.7
unless '1.9'.respond_to?(:force_encoding)
  String.class_eval do
    begin
      remove_method :chars
    rescue NameError
      # OK
    end
  end
end