[PATCH] fix wide character literal use in some test cases

[Paolo Carlini]

Jan Beulich wrote:

>So, bottom line - am I to re-do the patch with a 16-bit initializer
>then? Or will we go with the conditionals as in the already submitted
>patch?
>  
>
The former, without further ado, I would also add a short comment.

Thanks,
Paolo.