These vulkan headers are copied directly from their repo:
https://github.com/KhronosGroup/Vulkan-Headers
commit db09f95ac00e44149f3894bf82c918e58277cfdb
Version 1.1.83
Apache License 2.0

Change-Id: I593b6267dd35092fc9be243ac5209d47103c9a9d
Reviewed-on: https://swiftshader-review.googlesource.com/20348Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>