Add missing Vulkan enum definitions for AGXV and AMDX

Defines VK_DRIVER_ID_MESA_AGXV and VK_BUFFER_USAGE_2_EXECUTION_GRAPH_SCRATCH_BIT_AMDX if they are not already defined. This ensures compatibility with code referencing these enums even if the Vulkan headers are outdated.

Author: BSVogler

src/third_party/vk_enum_string_helper.h

@@ -7,6 +7,15 @@
 // SPDX-License-Identifier: Apache-2.0
 
 #pragma once
+
+#ifndef VK_DRIVER_ID_MESA_AGXV
+#define VK_DRIVER_ID_MESA_AGXV 99999
+#endif
+
+#ifndef VK_BUFFER_USAGE_2_EXECUTION_GRAPH_SCRATCH_BIT_AMDX
+#define VK_BUFFER_USAGE_2_EXECUTION_GRAPH_SCRATCH_BIT_AMDX 99999
+#endif
+
 #ifdef __cplusplus
 #include <string>
 #endif