Meta: Add overlay port for vulkan-loader

In order to pass the proper pkg-config on aarch64 linux, we need
to patch this port to use vcpkg's own find_tool infrastructure.

Meta/CMake/vcpkg/overlay-ports/vulkan-loader/portfile.cmake

@@ -0,0 +1,29 @@
+set(VCPKG_LIBRARY_LINKAGE dynamic)
+
+vcpkg_from_github(
+    OUT_SOURCE_PATH SOURCE_PATH
+    REPO KhronosGroup/Vulkan-Loader
+    REF "vulkan-sdk-${VERSION}"
+    SHA512 8ec98e0da867f829e048e100a97d7b94a3c40f56f858e3eb81f11f6f58e20e59da6ca8785a9642958ff3b698c618b9968407028cc66dfa0ad296576bf9db45ca
+    HEAD_REF main
+)
+
+vcpkg_find_acquire_program(PKGCONFIG)
+
+vcpkg_cmake_configure(
+  SOURCE_PATH "${SOURCE_PATH}"
+  OPTIONS
+    -DBUILD_TESTS:BOOL=OFF
+    -DPKG_CONFIG_EXECUTABLE="${PKGCONFIG}"
+    #-DBUILD_WSI_XCB_SUPPORT=OFF
+    #-DBUILD_WSI_XLIB_SUPPORT=OFF
+)
+vcpkg_cmake_install()
+vcpkg_fixup_pkgconfig()
+vcpkg_cmake_config_fixup(CONFIG_PATH "lib/cmake/VulkanLoader" PACKAGE_NAME VulkanLoader)
+
+vcpkg_install_copyright(FILE_LIST "${SOURCE_PATH}/LICENSE.txt")
+
+set(VCPKG_POLICY_EMPTY_INCLUDE_FOLDER enabled)
+
+configure_file("${CMAKE_CURRENT_LIST_DIR}/usage" "${CURRENT_PACKAGES_DIR}/share/${PORT}/usage" @ONLY)

Meta/CMake/vcpkg/overlay-ports/vulkan-loader/usage

@@ -0,0 +1,2 @@
+The package @PORT@ provides the vulkan loader.
+Please be aware of https://github.com/KhronosGroup/Vulkan-Loader/blob/main/docs/LoaderApplicationInterface.md#bundling-the-loader-with-an-application

Meta/CMake/vcpkg/overlay-ports/vulkan-loader/vcpkg.json

@@ -0,0 +1,19 @@
+{
+  "name": "vulkan-loader",
+  "version": "1.3.280.0",
+  "description": "Vulkan Development Tools",
+  "homepage": "https://github.com/KhronosGroup/Vulkan-Loader",
+  "license": null,
+  "supports": "!android",
+  "dependencies": [
+    {
+      "name": "vcpkg-cmake",
+      "host": true
+    },
+    {
+      "name": "vcpkg-cmake-config",
+      "host": true
+    },
+    "vulkan-headers"
+  ]
+}

vcpkg-configuration.json

@@ -5,5 +5,6 @@
       "location": "https://github.com/microsoft/vcpkg-ce-catalog/archive/refs/heads/main.zip",
       "name": "microsoft"
     }
-  ]
+  ],
+  "overlay-ports": [ "Meta/CMake/vcpkg/overlay-ports" ]
 }