If a monster animates the dead, only give the "The dead are walking!" message

if the player can see at least one of the corpses being raised.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5248 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on May 25, 2008
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