This doesn't release any copyright work in the game. So you will need to go through and remove any sprites, images, audio, etc that is copyright. Which means you will need to own a copy of the game (to have a right to the copyright usage) to use any binary produced from THIS source.
Additionally, it indicates that you must include in any derivative that the source of your code is from the EA drop here.
Outside of that, it is GPLv3. Of course it has hard dependency on DirectX 5.0. So a fully free version will need to redo those parts. Also the code is very MS VC++ heavy. Don't expect gcc to build you a binary.