Change direct.cc/h to directn.cc/h

Add YY_NO_UNISTD_H to MSVC builds, and turn off warn-as-error for now

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4398 c06c8d41-db1a-0410-9941-cceddc491573

Created by  pauldubois  on April 19, 2008
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