fix -Wunused-parameter

src/Mod/Part/App/Geom2d/ArcOfConic2dPyImp.cpp

@@ -51,7 +51,7 @@ PyObject *ArcOfConic2dPy::PyMake(struct _typeobject *, PyObject *, PyObject *)
 }
 
 // constructor method
-int ArcOfConic2dPy::PyInit(PyObject* args, PyObject* /*kwds*/)
+int ArcOfConic2dPy::PyInit(PyObject* /*args*/, PyObject* /*kwds*/)
 {
     return -1;
 }

src/Mod/Part/App/Geom2d/Conic2dPyImp.cpp

@@ -49,7 +49,7 @@ PyObject *Conic2dPy::PyMake(struct _typeobject *, PyObject *, PyObject *)  // Py
 }
 
 // constructor method
-int Conic2dPy::PyInit(PyObject* args, PyObject* kwds)
+int Conic2dPy::PyInit(PyObject* /*args*/, PyObject* /*kwds*/)
 {
     return 0;
 }

src/Mod/Part/App/Geometry2d.cpp

@@ -101,12 +101,12 @@ unsigned int Geometry2d::getMemSize (void) const
     return sizeof(Geometry2d);
 }
 
-void Geometry2d::Save(Base::Writer &writer) const
+void Geometry2d::Save(Base::Writer & /*writer*/) const
 {
     throw Base::NotImplementedError("Save");
 }
 
-void Geometry2d::Restore(Base::XMLReader &reader)
+void Geometry2d::Restore(Base::XMLReader & /*reader*/)
 {
     throw Base::NotImplementedError("Restore");
 }