Removed to load jit_support.rb

  It's removed at 4445b9e2a2dda207a2b3698c042342dd794b1b35

Author: hsbt

test/lib/jit_support.rb

@@ -3,10 +3,6 @@
 require 'test/unit'
 require 'open3'
 
-if RUBY_ENGINE == 'ruby'
-  require_relative 'lib/jit_support'
-end
-
 class TestOpen3 < Test::Unit::TestCase
   RUBY = EnvUtil.rubybin