Fixed a few warnings on Windows.
BuildAllExamples project files now working for VS 2011 and VS 2008 (VS 2005 still hasn't new project as I don't have VS 2005 installed anymore... we probably should drop support for that).

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4802 dfc29bdd-3216-0410-991c-e03cc46cb475