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/printing/printing.cpp

@@ -66,10 +66,6 @@ IMPLEMENT_APP(MyApp)
 // Writes a header on a page. Margin units are in millimetres.
 bool WritePageHeader(wxPrintout *printout, wxDC *dc, wxChar *text, float mmToLogical);
 
-MyApp::MyApp()
-{
-}
-
 // The `main program' equivalent, creating the windows and returning the
 // main frame
 bool MyApp::OnInit(void)
@@ -340,10 +336,6 @@ MyCanvas::MyCanvas(wxFrame *frame, const wxPoint& pos, const wxSize& size, long
     SetBackgroundColour(* wxWHITE);
 }
 
-MyCanvas::~MyCanvas(void)
-{
-}
-
 // Define the repainting behaviour
 void MyCanvas::OnDraw(wxDC& dc)
 {