vulkan: import vk_layer.h from Khronos

Instead of relying on the system having it (and the right version).

Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
25 jobs for !384 with vk_layer.h
detached