winemac: Clear the thread data explicitly on detach.

dlls/winemac.drv/macdrv_main.c

@@ -224,6 +224,8 @@ static void thread_detach(void)
         if (data->keyboard_layout_uchr)
             CFRelease(data->keyboard_layout_uchr);
         HeapFree(GetProcessHeap(), 0, data);
+        /* clear data in case we get re-entered from user32 before the thread is truly dead */
+        TlsSetValue(thread_data_tls_index, NULL);
     }
 }