Instead of leaking "kernel" pointers.
-- v2: winevulkan: Separate PE and Unix VkCommandBuffer structs. winevulkan: Wrap VkCommandPool on PE side. winevulkan: Separate PE and Unix VkPhysicalDevice strucrts. winevulkan: Separate PE and Unix VkInstance structs. winevulkan: Separate PE and Unix VkQueue structs. winevulkan: Separate PE and Unix VkDevice structs.