Now that flex has been updated, we can turn signed comparison warnings

back on.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4050 c06c8d41-db1a-0410-9941-cceddc491573

Created by  peterb12  on April 2, 2008
5VZOJ7OF2L7HHC2JYNXNYP2MV3ALNQ2ZAH2YJR6QNACGBV3A2WWAC
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