This reverts commit 5c8ea25014f ("ntdll: Use CLOCK_REALTIME_COARSE for NtQuerySystemTime() if it has sufficient resolution.")
CLOCK_*_COARSE only provides up to 1ms resolution at CONFIG_HZ=1000. OTOH, there are several ways to get up to 0.5ms resolution on modern Windows (high resolution waitable timers, NtSetTimerResolution with 0.5ms). This code path therefore has a possibility of behaving worse than native.
Since COARSE resolution is HZ dependent, this code path only runs if the kernel is configured with CONFIG_HZ=1000. Most distro ships does not ship with this. Therefore, this code path is rarely tested, and is more of a recipe for surprise. If any application rely on fast NtQuerySystemTime they are likely already broken for majority of Wine users.
Given the above reason, don't use CLOCK_REALTIME_COARSE. Use gettimeofday which is internally hooked to CLOCK_REALTIME.
-- v3: ntdll: Don't use CLOCK_REALTIME_COARSE