[bug #68574] [grog] report `-k` option as required if any input code point is non-ASCII

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Follow-up Comment #1, bug #68574 (group groff):=0A=0AAh, but we should _not=
_ detect a need for _preconv_ if a non-ASCII code point=0Aappears in a _rof=
f_ comment.=0A=0A(Maintaining enough state to ignore them in `ig`nored regi=
ons might not be=0Aworth the effort.)=0A=0A=0A    _________________________=
______________________________=0A=0AReply to this item at:=0A=0A  <https://=
savannah.gnu.org/bugs/?68574>=0A=0A________________________________________=
_______=0AMessage sent via Savannah=0Ahttps://savannah.gnu.org/=0A
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