Currently, this function is passed through winevulkan to the system's
Vulkan loader, which causes the loader to write the system's device
layers properties in pProperties.

Unreal Engine 4 then calls vkEnumerateDeviceExtensionProperties, using
VkLayerProperties::layerName as the pLayerName.

winevulkan's implementation of vkEnumerateDeviceExtensionProperties then
returns VK_ERROR_LAYER_NOT_PRESENT, crashing UE4.

This issue was found while debugging Project Wingman (Steam appid
895870), but it should also happen to any UE4 application using the
Vulkan RHI.
Signed-off-by: Victor Hermann Chiletto <v@hnn.net.br>
Signed-off-by: Joshua Ashton <joshua@froggi.es>
Signed-off-by: Liam Middlebrook <lmiddlebrook@nvidia.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>