Give a little handle to mingw LTO

Signed-off-by: falkTX <falktx@falktx.com>

examples/FileHandling/NanoButton.cpp

@@ -39,6 +39,10 @@ Button::Button(Widget* const parent, ButtonEventHandler::Callback* const cb)
     ButtonEventHandler::setCallback(cb);
 }
 
+Button::~Button()
+{
+}
+
 void Button::setBackgroundColor(const Color color)
 {
     backgroundColor = color;

examples/FileHandling/NanoButton.hpp

@@ -33,6 +33,7 @@ class Button : public NanoSubWidget,
 {
 public:
     explicit Button(Widget* parent, ButtonEventHandler::Callback* cb);
+    ~Button() override;
 
     void setBackgroundColor(Color color);
     void setFontScale(float scale);