graphics/vulkan-extension-layer: unbreak plist on i386 after 6d50e8b6ed88

Error: Orphaned: lib/libVkLayer_khronos_shader_object.so
Error: Orphaned: share/vulkan/explicit_layer.d/VkLayer_khronos_shader_object.json

https://github.com/KhronosGroup/Vulkan-ExtensionLayer/commit/0b90694e5e97