[PATCH] msvcrt/tests: Add iswdigit tests.

[Marvin]

Hi,

While running your changed tests, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?

Full results can be found at:
https://testbot.winehq.org/JobDetails.pl?Key=59756

Your paranoid android.


=== wxppro (32 bit report) ===

msvcrt:
string.c:3954: Test failed: iswdigit returned 0 for 7c2

=== w2003std (32 bit report) ===

msvcrt:
string.c:3954: Test failed: iswdigit returned 0 for 7c2