Don't include some header files when we don't need to.

src/debugger/gui/DebuggerDialog.cxx

@@ -68,6 +68,11 @@ DebuggerDialog::DebuggerDialog(OSystem& osystem, DialogContainer& parent,
                                          Menu::AppMode::debugger);
 }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+DebuggerDialog::~DebuggerDialog()
+{
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void DebuggerDialog::loadConfig()
 {

src/debugger/gui/DebuggerDialog.hxx

@@ -33,14 +33,16 @@ class TiaOutputWidget;
 class TiaZoomWidget;
 class CartDebugWidget;
 class CartRamWidget;
+class OptionsDialog;
 
+namespace GUI {
+  class MessageBox;
+}
 namespace Common {
   struct Rect;
 }
 
 #include "Dialog.hxx"
-#include "MessageBox.hxx"
-#include "OptionsDialog.hxx"
 
 class DebuggerDialog : public Dialog
 {
@@ -55,7 +57,7 @@ class DebuggerDialog : public Dialog
 
     DebuggerDialog(OSystem& osystem, DialogContainer& parent,
                    int x, int y, int w, int h);
-    virtual ~DebuggerDialog() = default;
+    virtual ~DebuggerDialog();
 
     const GUI::Font& lfont() const     { return *myLFont;        }
     const GUI::Font& nfont() const     { return *myNFont;        }

src/emucore/TIASurface.cxx

@@ -82,6 +82,11 @@ TIASurface::TIASurface(OSystem& system)
   myPaletteHandler->loadConfig(myOSystem.settings());
 }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+TIASurface::~TIASurface()
+{
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void TIASurface::initialize(const Console& console,
                             const FrameBuffer::VideoMode& mode)

src/emucore/TIASurface.hxx

@@ -22,13 +22,13 @@ class TIA;
 class Console;
 class OSystem;
 class FBSurface;
+class PaletteHandler;
 
 #include <thread>
 
 #include "Rect.hxx"
 #include "FrameBuffer.hxx"
 #include "NTSCFilter.hxx"
-#include "PaletteHandler.hxx"
 #include "PhosphorHandler.hxx"
 #include "bspf.hxx"
 #include "TIAConstants.hxx"
@@ -49,8 +49,7 @@ class TIASurface
       Creates a new TIASurface object
     */
     explicit TIASurface(OSystem& system);
-
-    virtual ~TIASurface() = default;
+    virtual ~TIASurface();
 
     /**
       Set the TIA object, which is needed for actually rendering the TIA image.