Fix VS project file (thx @ christianclavet for bugreport).

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4977 dfc29bdd-3216-0410-991c-e03cc46cb475
Identical expression was checked twice (found by cppcheck).


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4978 dfc29bdd-3216-0410-991c-e03cc46cb475