Add sanity check to make sure that monsters that can eat items but not

use weapons or armor don't do the latter.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@10631 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on September 7, 2009
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