kernel32 & winelib: Don't test string size in CompareStringW for null terminated strings

[Dan Kegel]

Adam Strzelecki wrote:
> Visual Studio is shipping with complete sources of C CRT so you may have a look.
> ;***
> ;strlen.asm - contains strlen() routine
> ;
> ;       Copyright (c) Microsoft Corporation. All rights reserved.

No, we may not have a look!  And we sure as hell can't
post copyrighted Microsoft source code on this mailing list!
- Dan