Use `FL_OVERRIDE` for all overridden virtual methods (#611)

FL_OVERRIDE is defined as `override` for C++11 and higher
FL_OVERRIDE is defined as `override` for VisualC 2015 and newer
Don't interfere with Fl_Widget::override()

1 files changed, 1 insertions, 1 deletions

diff --git a/test/boxtype.cxx b/test/boxtype.cxx
index 17733947a..29a89c3b6 100644
--- a/test/boxtype.cxx
+++ b/test/boxtype.cxx
@@ -52,7 +52,7 @@ static const int inactive  = 0; // deactivate boxes and use green background
 class BoxGroup : public Fl_Group {
   public:
     BoxGroup(int x, int y, int w, int h) : Fl_Group(x,y,w,h) {}
-    void draw() {
+    void draw() FL_OVERRIDE {
       draw_box();
       if (outline + box_bg) { // outline or box_bg or both
         Fl_Widget*const* a = array();