rspec-benchmark is not packaged

Forwarded: not-needed

--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -26,9 +26,6 @@
 RSpec.configure do |c|
   c.mock_with :rspec
   c.include(CustomMatchers)
-
-  require 'rspec-benchmark'
-  c.include RSpec::Benchmark::Matchers
 end
 
 if defined?(Encoding) && Encoding.respond_to?(:default_external=)