dxdiag: add basic commandline parsing (try 2)

[Jacek Caban]

Hi Austin,

Austin English wrote:
> Please apply after the first dxdiag patch (unicode-ify). Based on a
> patch by Dan Kegel.
>
>   
        case 'w':
+            opt_given = TRUE;
+            while (isalpha(*s) || *s == ':') 
+

You can't use isalpha on WCHAR. Use isalphaW instead.


Jacek