Fix variable to io::path for proper handling of WCHAR filesystem. Thanks to greenya for fix.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4519 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/COBJMeshWriter.cpp

@@ -64,7 +64,7 @@ bool COBJMeshWriter::writeMesh(io::IWriteFile* file, scene::IMesh* mesh, s32 fla
 
 	// write OBJ MESH header
 
-	core::stringc name;
+	io::path name;
 	core::cutFilenameExtension(name,file->getFileName()) += ".mtl";
 	file->write("# exported by Irrlicht\n",23);
 	file->write("mtllib ",7);