Fix: Added missing virtual destructors for classes with virtual functions.

Engine/source/gfx/screenshot.h

@@ -74,6 +74,7 @@ public:
   
    /// Constructor.
    ScreenShot();
+   virtual ~ScreenShot() { }
 
    /// Used to start the screenshot capture.
    void setPending( const char *filename, bool writeJPG, S32 tiles, F32 overlap );

Engine/source/gfx/video/videoCapture.h

@@ -221,6 +221,8 @@ protected:
    // List with bitmaps which are done encoding
    ThreadSafeDeque< GBitmap* > mProcessedBitmaps;
 public:
+   virtual ~VideoEncoder() { }
+
    // Stores an encoded bitmap to be dealt with later
    void pushProcessedBitmap( GBitmap* bitmap );