crypt32: implement W versions of string routines

[Juan Lang]

Stefan Leichter wrote:

>This patch breaks compilation of the tests with mingw.
>  
>
(snip)

>str.cross.o: In function `test_NameToStrConversionW':
>/usr/src/wine/wine-mingw/dlls/crypt32/tests/../../../../wine/include/wine/debug.h:179: undefined reference to `_wine_dbgstr_wn'
>  
>
This isn't the only test suite to use wine_dbg_str, mlang's does as 
well.  How do you deal with it for mlang?
--Juan