[PATCH v2 0/2] MR8591: Draft: ntdll: Fill EnabledFeatures before return.

[Bernhard Übelacker]

Followup to 03039ab2ee.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=58335

If I observed it right we currently leave `init_xstate_features` on older computers with EnabledFeatures being zero.
This leads in `__wine_syscall_dispatcher` to getting the xsave64 getting
called with "$rax = 0x0", therefore e.g. xmm6 gets not saved to the stack.
But later e.g. xmm6 gets restored from stack in `__wine_syscall_dispatcher` (see [__wine_syscall_dispatcher](https://gitlab.winehq.org/wine/wine/-/blob/wine-10.12/dlls/ntdll/unix/signal...))

--
  v2: ntdll/tests: Allow non-AVX CPUs in XState feature tests.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/8591