ntdll/tests: Add test for deleting via NtOpenFile

[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
https://newtestbot.winehq.org/JobDetails.pl?Key=3962

Your paranoid android.


=== w7pro64 (32 bit file) ===
file.c:331: Test failed: open L"system32" failed c000003b
file.c:338: Test failed: open L"SYSTEM32" failed c000003b
file.c:346: Test failed: open L"\\SYSTEM32" failed c0000034
file.c:356: Test failed: open L"\\SYSTEM32" failed c000003b