Make sure anonymous friendly monsters count as friendly for the purposes

of undead slave kills.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9871 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on May 31, 2009
34V2PK5JB4MB3K4BYG3AHRTSSBO2Z4IEQX7HX3VWDJE2F2BMRTDAC
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