Fix deprecated F symbol.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@10557 c06c8d41-db1a-0410-9941-cceddc491573

Created by  evktalo  on August 17, 2009
HREEIZOIFTZCOAWMT72L3ISVQHJDFZSEGUMEIGRLHCYHZEZLPLOQC
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