get their darts in give_ammo() instead of give_weapon(). One side effect of fixing this is that it is now possible for kobolds and big kobolds to get both a melee weapon and darts. Since both darts and the melee weapons that kobolds and big kobolds can get are relatively weak, I also think this is okay for now.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3087 c06c8d41-db1a-0410-9941-cceddc491573
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