get rid of unnecessary libunicode dependencies in some more places

[Mike McCormack]

Thomas Weidenmueller wrote:

> -    sz = strlenW(fmt) + 1;
> +    sz = wcslen(fmt) + 1;

libc and wine may have differing interpretations of what wchar_t. 
Specifically, if -fshort-wchar is not used, wchar_t will be int, won't it?

You'd be better off using lstrlenW() than wcslen(), but that will be 
slow since it has an exception handler.  Alexandre was talking about 
making an inline wine only version of lstrlenW() without the exception 
handler to solve that problem.

Mike