fix -Wextra in Main & Complete

src/Main/FreeCADGuiPy.cpp

@@ -238,7 +238,7 @@ struct PyMethodDef FreeCADGui_methods[] = {
      "an event loop or showing up any GUI\n"},
     {"embedToWindow",FreeCADGui_embedToWindow,METH_VARARGS,
      "embedToWindow() -- Embeds the main window into another window\n"},
-    {NULL, NULL}  /* sentinel */
+    {NULL, NULL, 0, NULL}  /* sentinel */
 };
 
 static

src/Mod/Complete/Gui/Command.cpp

@@ -50,9 +50,9 @@ CmdCompleteConstraintAxle::CmdCompleteConstraintAxle()
 
 void CmdCompleteConstraintAxle::activated(int iMsg)
 {
+    Q_UNUSED(iMsg);
     // load the file with the module
     //Command::doCommand(Command::Gui, "import Complete, CompleteGui");
-      
 }