Bug#859294: hunspell-dict-ko: FTBFS: UnicodeDecodeError: 'ascii' codec can't decode byte 0xed in position 38: ordinal not in range(128)

[Changwoo Ryu]

It only fails on a legacy non-Unicode locale, such as "C".

So what is a solution? Specifying a UTF-8 locale and Build-Depending
on locales-all do not seems to be a right way.