monster's wielding two weapons to a bit in the monster struct, instead
of hardcoding a list of such monsters in mons_wields_two_weapons().
Courtesy of bobbens.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2931 c06c8d41-db1a-0410-9941-cceddc491573
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