Codechange: [Video] make the prototype of PollEvent() the same for all drivers

Additionally, call it from the draw-tick.

src/video/cocoa/cocoa_v.h

@@ -62,6 +62,7 @@ protected:
 	void InputLoop() override;
 	bool LockVideoBuffer() override;
 	void UnlockVideoBuffer() override;
+	bool PollEvent() override;
 
 	void GameSizeChanged();
 
@@ -79,8 +80,6 @@ protected:
 	virtual void ReleaseVideoPointer() {}
 
 private:
-	bool PollEvent();
-
 	bool IsFullscreen();
 };
 

src/video/cocoa/cocoa_v.mm

@@ -440,8 +440,6 @@ void VideoDriver_Cocoa::GameLoop()
 
 			InteractiveRandom(); // randomness
 
-			while (this->PollEvent()) {}
-
 			if (_exit_game) {
 				/* Restore saved resolution if in fullscreen mode. */
 				if (this->IsFullscreen()) _cur_resolution = this->orig_res;