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/gtk1/gsockgtk.cpp

@@ -25,7 +25,7 @@
 extern "C" {
 static
 void _GSocket_GDK_Input(gpointer data,
-                        gint source,
+                        gint WXUNUSED(source),
                         GdkInputCondition condition)
 {
   GSocket *socket = (GSocket *)data;