Using headers from https://github.com/KhronosGroup/Vulkan-Headers at
tag v1.2.141.

* Modified vulkan.h to still include vulkan_fuchsia_extras.h like
  before.

* VK_NVX_device_generated_commands was replaced with a
  non-experimental version VK_NV_device_generated_commands.
  So replaced the symbols in VkStringify too.

* Preserved the line endings of the existing files.

* Note that VK_PIPELINE_BIND_POINT_RANGE_SIZE doesn't include the Ray
  Tracing pipeline bind point.  This is fine since it is not supported
  by SwiftShader.

Bug: b/157856449
Change-Id: I85f865e128dc034d39a24223621c105f9d1f5b03
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/45429
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>