monsters uses a special/nearby ability or before it speaks, in addition to before it uses a spell.
Ensure that two monsters won't speak to each other if neither is close to the player.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8472 c06c8d41-db1a-0410-9941-cceddc491573
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