Add wrap dependency for vulkan headers

Don't expect the vulkan headers to be present on the development system. Instead, download the using meson wrap.

Signed-off-by: Piotr Krygier <piotrkrygier@everyonecancode.xyz>

subprojects/packagefiles/vulkan_headers/meson.build

@@ -0,0 +1,15 @@
+project(
+  'vulkan-headers',
+  'c',
+  license: 'Apache-2.0',
+  version: '1.4.353',
+  meson_version: '>=0.56.0',
+)
+
+vulkan_api_xml = files('registry/vk.xml')
+
+vulkan_headers_dep = declare_dependency(
+  include_directories: include_directories('include'),
+)
+
+meson.override_dependency('VulkanHeaders', vulkan_headers_dep)