monster_die() should place corpses and make summoned corpses disappear in a

puff of smoke even during arena mode. (Oops)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8107 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on January 2, 2009
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