I've learned the hard way that it doesn't make sense to discuss this stuff before you actually have the code. So I'd suggest you first go and see if you can get the authors of that dll to agree to relicense for you and once that's done, we can discuss what happens with Wine's copy.
I'll try to make this process a little easier for you. The code was MIT/X11 licensed prior to 2002, so you don't need explicit permission from authors prior to that time. Furthermore, some of the authors since that time have explicitly licensed their contributions as LGPL and MIT/X11. At least Eric Pouch and I are in that set. Transgaming has a list somewhere, though I couldn't find it just now.
The main contributors that have not done so that I saw after a quick perusal were Alexandre and Rob Shearman. If you can't get their permission, you'd have to start with the last MIT/X11 licensed version, or get Transgaming's most recent ReWind version and start from there. --Juan