Fix cursor going bats after message window scrolls with delay_message_clear=yes

on Unix.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@848 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on January 14, 2007
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