Clean up set_equip_race() to make it more readable, and also to properly

disable elven bolts and dwarven arrows (so that e.g. dwarven transmuters don't start with the latter).

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2944 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on November 29, 2007
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