Classes that have unique_ptr in headers can't also have defaulted d'tors.

I haven't figured out exactly why this is yet, but compilation fails in gcc and clang otherwise.

src/gui/CommandDialog.cxx

@@ -41,16 +41,16 @@ CommandDialog::CommandDialog(OSystem& osystem, DialogContainer& parent)
   // Set real dimensions
   _w = 3 * (buttonWidth + 5) + HBORDER * 2;
   _h = 6 * rowHeight - VGAP + VBORDER * 2 + _th;
-  ButtonWidget* bw;
+  ButtonWidget* bw = nullptr;
   WidgetArray wid;
   int xoffset = HBORDER, yoffset = VBORDER + _th;
 
   auto ADD_CD_BUTTON = [&](const string& label, int cmd)
   {
-    ButtonWidget* bw = new ButtonWidget(this, _font, xoffset, yoffset,
+    ButtonWidget* b = new ButtonWidget(this, _font, xoffset, yoffset,
             buttonWidth, buttonHeight, label, cmd);
     yoffset += buttonHeight + VGAP;
-    return bw;
+    return b;
   };
 
   // Column 1

src/gui/UIDialog.cxx

@@ -196,6 +196,11 @@ UIDialog::UIDialog(OSystem& osystem, DialogContainer& parent,
   addBGroupToFocusList(wid);
 }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+UIDialog::~UIDialog()
+{
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void UIDialog::loadConfig()
 {

src/gui/UIDialog.hxx

@@ -35,7 +35,7 @@ class UIDialog : public Dialog
 {
   public:
     UIDialog(OSystem& osystem, DialogContainer& parent, const GUI::Font& font);
-    virtual ~UIDialog() = default;
+    virtual ~UIDialog();
 
   private:
     void loadConfig() override;