Fix a security hole introduced in r7048 (bad parsing of search regexps.)

Add -Wno-parentheses to remove all the warnings about && vs. ||. (I agree with g++ here, actually…)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7821 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on December 13, 2008
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