Backport #4348: fix stateless-iso-2022-jp
http://redmine.ruby-lang.org/issues/show/4348

µ¯É¼???: Nobuyoshi Nakada
??¹ã????¼ã?¿ã??: Assigned, ??ªå??åº?: Normal
???å½????: Yuki Sonoda, ??«ã????´ã??: M17N

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