[Mutt] #3024: to_chars not utf-8 capable

[Mutt <fleas@xxxxxxxx>]

#3024: to_chars not utf-8 capable

 putting multi-byte chars into to_chars produces garbage, as addressing is
 done by byte index.

 without having tested it, i assume status_chars suffers the same problem.

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Ticket URL: <http://dev.mutt.org/trac/ticket/3024>