Remove now-redundant prototype.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6066 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on June 22, 2008
CS73M7DGUME6OF4WN2IJPIJGYNUJYVPB3VEG2XCSX7K5N6RLQ4JAC
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