From my understanding it does allow for re-licensing. As it says, "Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:"
If it could not be re-licensed it would not be without restriction. We do have to include the original license, but we have had to do that with all the other files that have a copyright and license on them. But if you notice, it expressly gives the right to sublicense.