benchmarks/vkmark: unbreak build after f70aabfff8e6
../src/vulkan_state.cpp:72:8: error: explicit specialization of undeclared template struct 'isDispatchLoader'
72 | struct isDispatchLoader<::DebugUtilsDispatcher> | ^ ~~~~~~~~~~~~~~~~~~~~~~~~
../src/ws/kms_window_system.cpp:425:8: error: explicit specialization of undeclared template struct 'isDispatchLoader'
425 | struct isDispatchLoader<::GetFormatProperties2Dispatcher>
| ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Reported by: pkg-fallout