Disallow enchanted ancuses, as they're clubs, and the associated comment

says that "nobody would bother enchanting a club". Also, clean up random item generation a bit more; some of it is redundant, given the logic in set_equip_race().

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3069 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on December 15, 2007
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