msvcrt: Return error in stat function when path is specified with trailing slash character

[Marvin]

Hi,

While running your changed tests on Windows, 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
http://testbot.winehq.org/JobDetails.pl?Key=23632

Your paranoid android.


=== WNT4WSSP6 (32 bit file) ===
file.c:1449: Test failed: stat returned 0
file.c:1450: Test failed: errno = -559038737
file.c:1514: Test failed: stat returned 0
file.c:1515: Test failed: errno = -559038737