[Python-3000] Py3k_struni additional test failures under cygwin

[Stephen J. Turnbull]

Joe Smith writes:

 > Cygwin's setlocale function only supports the "C" locale.
 > I am a bit suprised that ASCII is returned rather than the system's default 
 > encoding.

If I understand the situation correctly, you shouldn't be.  The C
locale is defined to use ASCII.