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

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4977 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/Irrlicht9.0.vcproj

@@ -2735,6 +2735,7 @@
 				<File
 					RelativePath="os.cpp"
 					>
+				</File>
 				<File
 					RelativePath="utf8.cpp"
 					>