advapi32: Add tests for getting the groups, user and privileges of a token.

[Saulius Krasuckas]

* On Sat, 13 May 2006, Robert Shearman wrote:
> 
> +static void test_token_attr(void)
> +{
  ...
> +    LPTSTR SidString;
  ...
> +        ConvertSidToStringSid(Groups->Groups[i].Sid, &SidString);

This makes advapi32_test.exe to not load on w9x.  The missing import is 
advapi32!ConvertSidToStringSidA.  As I want to get this fixed I am trying 
to understand what version (A or W) should this call be converted to.  
But after noticing LPTSTR I am lost :)

Is the use of LPTSTR intended to be here?  I find only three files of 
winetest code this type is used in:

dlls\advapi32\tests\security.c
dlls\comctl32\tests\comboex.c
dlls\user\tests\wsprintf.c

Why? Is it OK, at least?