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the case that the last byte is '\r' correctly.
(decode_coding_emacs_mule): Likewise.
(decode_coding_iso_2022): Likewise.
(decode_coding_sjis): Likewise.
(decode_coding_big5): Likewise.
(decode_coding_charset): Likewise.
(produce_chars): Likewise.
(decode_coding): Flushing out the unprocessed data correctly.
(decode_coding_gap): Set CODING_MODE_LAST_BLOCK bit of
coding->mode.