The zlib project is not using mfc, and vs2013 didn't like that it was MFC and non-unicode, so I removed the MFC flag (from all the projects).

git-svn-id: http://pcsx2.googlecode.com/svn/trunk@5788 96395faa-99c1-11dd-bbfe-3dabce05a288
Whoops, I also changed these.

git-svn-id: http://pcsx2.googlecode.com/svn/trunk@5789 96395faa-99c1-11dd-bbfe-3dabce05a288