Part: Fix compiler warnings [-Wodr]

Type 'struct EdgePoints' violates the C++ One Definition Rule because it's defined in two different translation units

src/Mod/Part/App/AppPartPy.cpp

@@ -152,12 +152,17 @@ PartExport std::vector<TopoShape> getPyShapes(PyObject *obj) {
     return ret;
 }
 
+namespace
+{
+
 struct EdgePoints {
     gp_Pnt v1, v2;
     std::list<TopoDS_Edge>::iterator it;
     TopoDS_Edge edge;
 };
 
+}
+
 PartExport std::list<TopoDS_Edge> sort_Edges(double tol3d, std::list<TopoDS_Edge>& edges)
 {
     tol3d = tol3d * tol3d;