[kernel/user32] Some Specs

[Jonathan Wilson]

BTW, implementations for WCSToMBEx and MBToWCSEx can be found here:
http://article.gmane.org/gmane.comp.emulators.wine.patches/5049/

I dont have a usable setup to turn them into proper patches but if anyone 
wants to use them for WINE, go ahead and grab them.

Not sure how usefull they would be but I suspect that they may bring WINE 
closer to the point where native WINIMM.DLL works.