Bug 2007644: necromanctic miscasts could cause an undead player to rot

even though the undead should be immune to rotting.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6328 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on July 2, 2008
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