Prevent Crawl from going into an infinite loop during newgame setup

if an incompatible class/race combination is specified in the init file.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2202 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on September 25, 2007
DE2BXPJDLWN7F3LAYKUSWI5CFEYZMV2ZN4K2Y356NWIX4AIGD73QC
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