Now that everything in the player's inventory is identified at the start

of the game, simplify _give_basic_knowledge() to only give knowledge of things that wouldn't be in the player's inventory.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9193 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on February 24, 2009
RCYZVUVY4BLXETNDXF4LLWK67Q6YDELECMF4WKGTDFWZOLEYA3QQC
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