Remove warnings about non-virtul destrutors in test

test/parent_from_member_test.cpp

@@ -70,6 +70,7 @@ struct DerivedPoly2
    virtual void virtual_func2(){}
    Abstract2 *abstract2()             {  return this; }
    Abstract2 const *abstract2() const {  return this; }
+   virtual ~DerivedPoly2(){}
 } derivedpoly2;
 
 struct MultiInheritance2
@@ -86,6 +87,7 @@ struct VirtualDerivedPoly
    float virtualderivedpoly_float_;
    virtual void f1(){}
    virtual void f2(){}
+   virtual ~VirtualDerivedPoly(){}
 } virtualderivedpoly;
 
 struct VirtualMultipleDerivedPoly
@@ -95,6 +97,7 @@ struct VirtualMultipleDerivedPoly
    float virtualmultiplederivedpoly_float_;
    virtual void f1(){}
    virtual void f2(){}
+   virtual ~VirtualMultipleDerivedPoly(){}
 } virtualmultiplederivedpoly;
 
 struct VirtualDerived
@@ -104,6 +107,7 @@ struct VirtualDerived
    float virtualderived_float_;
    virtual void f1(){}
    virtual void f2(){}
+   virtual ~VirtualDerived(){}
 } virtualderived;
 
 using namespace boost::intrusive;