Required for implementation correctness check in certain protection software.
Thanks to mkrsym1 mkrsym1@gmail.com for the patch!
-- v4: ntdll/tests: Add tests for ret_len on NtQueryInformationThread HideFromDebugger. ntdll: Return STATUS_ACCESS_VIOLATION from NtQueryInformationThread ThreadHideFromDebugger if *ret_len is not writable.