I'm aware that winecfg allows unlinking of symlinked folders, but this is very annoying when regularly recreating WINEPREFIXES. This change makes it easy to isolate those folders from the start.
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v5: ntdll: Add environment variable to prevent symlinking dosdevices/z:
shell32: Add environment variable to prevent symlinking home folders
https://gitlab.winehq.org/wine/wine/-/merge_requests/3259