Enabling PCRE in Windows makefiles. Because we release with libpcre enabled, it makes sense to have that be on by default.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6507 c06c8d41-db1a-0410-9941-cceddc491573

Created by  ennewalker  on July 11, 2008
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