fix a few hundreds of harmless unused parameters warnings and a couple of real bugs discovered thanks to them

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@49659 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/x11/utils.cpp

@@ -83,7 +83,7 @@ void wxFlushEvents()
     // ??
 }
 
-bool wxCheckForInterrupt(wxWindow *wnd)
+bool wxCheckForInterrupt(wxWindow *WXUNUSED(wnd))
 {
     wxFAIL_MSG(wxT("wxCheckForInterrupt not yet implemented."));
     return false;