bug#71754: 30.0.60; Reference to deleted variable `utf-fragment-on-decoding' in cyrillic.el

[Stefan Kangas]

Severity: minor

In lisp/languages/cyrillic.el, there is a reference to the seemingly
removed user option `utf-fragment-on-decoding':

    ;; Customizing `utf-fragment-on-decoding' allows decoding characters
    ;; from KOI and Alternativnyj into 8859-5 where that's possible.
    ;; cyrillic-iso8859-5 characters take half as much space in the buffer
    ;; as the mule-unicode-0100-24ff equivalents, though that's probably
    ;; not normally a big deal.

I don't know if this should be updated or deleted.