Add VideoSource::update() function declaration

src/Sources/VideoSource.h

@@ -28,10 +28,7 @@ class VideoSource : public BaseSource {
 		void clear();
         void togglePause();
         void stop();
-
+		void update(ofEventArgs & args);
-		#ifndef TARGET_RASPBERRY_PI
-			void update(ofEventArgs & args);
-		#endif
 
 	private: