Add state.cc to the Xcode build and massage the compile settings to deal

with the fact that yacc on 10.5 emits code that the compiler's default settings don't like – signed/unsigned comparisons, specifically.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2190 c06c8d41-db1a-0410-9941-cceddc491573

Created by  nlanza  on September 24, 2007
KSXUQUYKGZBC4CVNPO5ICBSAAWEPU4VUHRF5IKNS7FMTXJX7WKDQC
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