abjurable monsters stay around permanently.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3965 c06c8d41-db1a-0410-9941-cceddc491573
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// If the extended stay is long enough, make it permanent.
// If the extended stay is long enough, make it permanent. Note
// that we have to delete the enchantment without removing the
// enchantment effect, in order to keep the monster from
// disappearing.