[VK] Rework SPIRV Shader Optimization (#238)

The actual SPIRV Shader Optimization option doesn't seem to do anything as long as it isn't vinculed, so let's rework it to make it work

Co-authored-by: Gamer64 <76565986+Gamer64ytb@users.noreply.github.com>
Co-authored-by: echosys <echosys@noreply.localhost>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/238

externals/CMakeLists.txt

@@ -160,6 +160,12 @@ if (YUZU_USE_EXTERNAL_VULKAN_UTILITY_LIBRARIES)
     add_subdirectory(Vulkan-Utility-Libraries)
 endif()
 
+# SPIRV-Tools
+if (YUZU_USE_EXTERNAL_VULKAN_SPIRV_TOOLS)
+    set(SPIRV_SKIP_EXECUTABLES ON)
+    add_subdirectory(SPIRV-Tools)
+endif()
+
 # Boost headers
 add_subdirectory(boost-headers)
 

externals/dynarmic/src/dynarmic/backend/x64/abi.cpp

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 /* This file is part of the dynarmic project.
  * Copyright (c) 2020 MerryMage
  * SPDX-License-Identifier: 0BSD