[PATCH v2] ntdll: Fix tick count calculation on Mac.

[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=60963

Your paranoid android.


=== debian10 (32 bit WoW report) ===

kernel32:
debugger: Timeout

=== debian10 (64 bit WoW report) ===

kernel32:
change.c:320: Test failed: should be ready
comm.c:918: Test failed: OutQueue should not be empty