Consolidate checks for the player's being undead or a demonspawn into

player_is_unholy(), a la mons_is_unholy(), and use it where possible.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8522 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on January 17, 2009
OLMTUY4KVSPRWQKIOLSIYRAUEVJLRDJV7CCXJRW7IKWGUHSNRZTAC
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