Remove dead code.

code/AssetLib/3MF/D3MFOpcPackage.h

@@ -45,7 +45,6 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <memory>
 #include <string>
 #include <assimp/IOSystem.hpp>
-//#include <assimp/irrXMLWrapper.h>
 
 namespace Assimp {
     class ZipArchiveIOSystem;