https://bugs.winehq.org/show_bug.cgi?id=50905
--- Comment #3 from Dmitry Timoshkov dmitry@baikal.ru --- (In reply to Alexandre Julliard from comment #2)
You can remove the ntdll placeholder to force a prefix update. Ultimately the goal is to make builtin behave more like native, so removing dlls will break things, just like on Windows.
I'm afraid that's not always possible for existing prefixes, especially on a client site in a production environment.