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/TopoShapeExpansion.cpp

@@ -3119,6 +3119,9 @@ TopoShape& TopoShape::makeElementWires(const std::vector<TopoShape>& shapes,
     return makeElementCompound(wires, nullptr, SingleShapeCompoundCreationPolicy::returnShape);
 }
 
+namespace
+{
+
 
 struct EdgePoints
 {
@@ -3145,6 +3148,8 @@ struct EdgePoints
     }
 };
 
+}
+
 TopoShape TopoShape::reverseEdge(const TopoShape& edge)
 {
     Standard_Real first = NAN;