Fix -Wnon-virtual-dtor compiler warnings.

core/include/fxge/fx_dib.h

Index: core/include/fxge/fx_dib.h
diff --git a/core/include/fxge/fx_dib.h b/core/include/fxge/fx_dib.h
index d8a2003548c8bee1739405ab79e62a056390554c..179a61a8353803e41e783073893bb71c89f6db61 100644
--- a/core/include/fxge/fx_dib.h
+++ b/core/include/fxge/fx_dib.h
@@ -402,19 +402,18 @@ protected:
 class IFX_ScanlineComposer
 {
 public:
+    virtual ~IFX_ScanlineComposer() { }
 
     virtual	void		ComposeScanline(int line, FX_LPCBYTE scanline, FX_LPCBYTE scan_extra_alpha = NULL) = 0;
 
-
     virtual FX_BOOL		SetInfo(int width, int height, FXDIB_Format src_format, FX_DWORD* pSrcPalette) = 0;
 };
 class CFX_ScanlineCompositor : public CFX_Object
 {
 public:
-
     CFX_ScanlineCompositor();
 
-    ~CFX_ScanlineCompositor();
+    virtual ~CFX_ScanlineCompositor();

[brucedawson, 2015/01/09 00:20:49]

This one feels dirty because clearly CFX_Object does not have a virtual
destructor, so adding one here doesn't guarantee correctness. Do the protected
destructor trick here instead?

[Tom Sepez, 2015/01/09 01:16:53]

I don't think this one ended up needing to be modified.  Will remove.

 
     FX_BOOL				Init(FXDIB_Format dest_format, FXDIB_Format src_format, FX_INT32 width, FX_DWORD* pSrcPalette,
                              FX_DWORD mask_color, int blend_type, FX_BOOL bClip, FX_BOOL bRgbByteOrder = FALSE, int alpha_flag = 0, void* pIccTransform = NULL);