* fix(components): a native-only override falls back to builtin when the prefix has no native DLL
A component that asks for a DLL native-only (for example .NET 4.8's mscoree=n) left the DLL unloadable when its native copy never reached the prefix. On ARM64 prefixes the .NET installer leaves Wine's builtin mscoree in system32, so every program that needs .NET exited at launch with 'mscoree.dll not found'.
At launch, an override of n for a DLL whose system32 or syswow64 copy is missing or is Wine's own (a link into the Proton build, or a builtin or placeholder stub) becomes n,b, and the session log says so. A real native copy is still loaded first, and the saved component state is unchanged, so the override returns to n once the native DLL is there.
* Treat any prefix symlink as builtin when checking native overrides
* Treat an unreadable prefix DLL as missing for native overrides
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