Missed beams from monsters now trigger AI_MONSTER_ATTACKS interrupt.

Fixes 1841439.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2946 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on November 30, 2007
FC7M3JHVRPOLZP7YWOJN4O6YJV7KRJUMPLTI2Q4ANCO7GD23YKWQC
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