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>

graphics/meson.build

@@ -15,6 +15,8 @@ rse_graphics_sources = [
   'src/window.c',
 ]
 
+vulkan_headers_dep = dependency('VulkanHeaders')
+
 vulkan_dep = dependency('Vulkan')
 
 sdl3_dep = dependency('sdl3', version: '>=3.4.0')
@@ -32,6 +34,7 @@ rse_graphics_lib = shared_library(
   rse_graphics_sources,
   include_directories: ['../'],
   dependencies: [
+    vulkan_headers_dep,
     vulkan_dep,
     vma_dep,
     sdl3_dep,
@@ -46,6 +49,7 @@ rse_graphics_lib = shared_library(
 rse_graphics_lib_dep = declare_dependency(
   link_with: rse_graphics_lib,
   dependencies:  [
+    vulkan_headers_dep,
     vulkan_dep,
     vma_dep,
     glm_dep