It wasn't used in Finch, was a no-op in pidgin, and none of the protocol plugins
used it. In the future we'll just add a "notice" flag or something to
PurpleMessage when we need it.
Testing Done:
Compiled
Reviewed at https://reviews.imfreedom.org/r/1808/
PidginandFinch:ThePimpin' Penguin IM Clients That'reGoodfortheSoul
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