Fix #34121: OSL + persistent images option was not freeing shader memory properly,

causing memory to increase continuously during animation render.

intern/cycles/render/osl.h

@@ -64,6 +64,8 @@ public:
 	OSLShaderManager();
 	~OSLShaderManager();
 
+	void reset(Scene *scene);
+
 	bool use_osl() { return true; }
 
 	void device_update(Device *device, DeviceScene *dscene, Scene *scene, Progress& progress);