Squash unused-variable warnings by only declaring variables that exist solely

for ASSERT when we're defining DEBUG.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2462 c06c8d41-db1a-0410-9941-cceddc491573

Created by  nlanza  on October 14, 2007
IUDVLWOGBILC6LJSFFGGKIZWCLASE4K53YXUEEEYH5IOQUQAZMTAC
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