This was preventing wow64 from working on Apple Silicon/Rosetta.
Based on a patch by Tim Clem tclem@codeweavers.com.
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=54367
-- v2: ntdll: Add a WARN when setting debug registers fails under Rosetta. server: On macOS, fake debug registers when running under Rosetta.