made it work with new fpc

materialsystem/vulkan/vulkan_state.h

@@ -256,6 +256,7 @@ void CVk##name##PipelineLibrary::Build() \
 class CVkShader : public IShader
 {
 public:
+	~CVkShader();
 	void AddShaderLibrary( CVkPipelineLibrary *pLibrary );
 	void Build();
 	virtual uint32_t PSGetResourceByName( const char *szName ) override;