moz#1256496 we *unset* the utf-8 bit and reset it again later
moz#1256496 we *unset* the utf-8 bit and reset it again later

which seems bizarre to me, but if we do this then csconv may
be null, detect that and skip.

hunspell/hunspell,hunspell/hunspell,hunspell/hunspell,hunspell/hunspell