Fix deleting FrameManagerImpl*

delete playerHandleInfo->frameManager wasn't actually calling
FrameManagerImpl~, because playerHandleInfo->frameManager is only a
FrameManager, which didn't have a destructor, and nothing was saying that
it's actually a FrameManagerImpl behind. Adding a virtual destructor
fixes that.

src/speechPlayer/src/frame.h

@@ -51,6 +51,7 @@ class FrameManager {
 	virtual void queueFrame(speechPlayer_frame_t* frame, unsigned int minNumSamples, unsigned int numFadeSamples, int userIndex, bool purgeQueue)=0;
 	virtual const speechPlayer_frame_t* const getCurrentFrame()=0;
 	virtual const int getLastIndex()=0; 
+	virtual ~FrameManager() {};
 };
 
 #endif