Warning fixes found under hardest mode of OpenWatcom. Seems clean in Borland, MinGW and DMC.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@29684 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/opengl/isosurf/isosurf.cpp

@@ -373,10 +373,6 @@ TestGLCanvas::TestGLCanvas(wxWindow *parent, wxWindowID id,
 }
 
 
-TestGLCanvas::~TestGLCanvas()
-{
-}
-
 void TestGLCanvas::OnPaint( wxPaintEvent& WXUNUSED(event) )
 {
     // This is a dummy, to avoid an endless succession of paint messages.

samples/opengl/isosurf/isosurf.h

@@ -29,7 +29,7 @@ public:
         const wxSize& size = wxDefaultSize, long style = 0,
         const wxString& name = _T("TestGLCanvas"), int *gl_attrib = NULL);
 
-   ~TestGLCanvas();
+   ~TestGLCanvas(){};
 
     void OnPaint(wxPaintEvent& event);
     void OnSize(wxSizeEvent& event);