Deprecate support of older `config.ru`
Since Rails 4.0, `config.ru` generated by default uses instances of `Rails.application`. Therefore, I think that it is good to deprecate the old behavior. Related: #9669
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Since Rails 4.0, `config.ru` generated by default uses instances of `Rails.application`. Therefore, I think that it is good to deprecate the old behavior. Related: #9669