[PATCH v2 1/2] msvcrt/tests: Add tests for _creat.

[Piotr Caban]

Hi,

please fix the implementation in first patch and then add test in 
second. Currently the tests are using garbage data from stack causing 
random failures:
file.c:2419: Test failed: expected read-only file
file.c:2441: Test succeeded inside todo block: expected rw file

Thanks,
Piotr