vulkan: import vk_layer.h from Khronos
Instead of relying on the system having it (and the right version).
(vk_layer.h
is used by the vulkan overlay layer)
/cc @llandwerlin
Instead of relying on the system having it (and the right version).
(vk_layer.h
is used by the vulkan overlay layer)
/cc @llandwerlin