message: Vulkan: Don't use vulkan.h's prototypes.
  VulkanFunctions handles the storing of Vulkan function pointers so Dawn
  doesn't need the declarations for Vulkan entrypoints.
diff: @@ -143,6 +143,7 @@ namespace dawn_native { namespace vulkan {
  } \
  } // namespace dawn_native::vulkan
  +#define VK_NO_PROTOTYPES
  #include <vulkan/vulkan.h>
  // Redefine VK_NULL_HANDLE for better type safety where possible.
  