Only define Objetc#itself when it is not defined
Ruby 2.2 will include Kernel#itself so we don't need to define again. See https://github.com/ruby/ruby/commit/0a0160d6b659f6131a525fe1579e7c463d4c197e
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Ruby 2.2 will include Kernel#itself so we don't need to define again. See https://github.com/ruby/ruby/commit/0a0160d6b659f6131a525fe1579e7c463d4c197e