Fix bug #2510205: prevent monsters from using visual speech messages when

the player can't see them.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8469 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on January 15, 2009
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