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/unittest_symbol.cxx b/test/unittest_symbol.cxx
index e6506ae4d..742660c12 100644
--- a/test/unittest_symbol.cxx
+++ b/test/unittest_symbol.cxx
@@ -51,7 +51,7 @@ public:
   Ut_Symbol_Test(int x, int y, int w, int h)
     : Fl_Widget(x, y, w, h) {
   }
-  void draw(void) {
+  void draw(void) FL_OVERRIDE {
     int x0 = x(); // origin is current window position for Fl_Box
     int y0 = y();
     int w0 = w();