mark all dtors which are virtual because base class dtor is virtual explicitly virtual themselves

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41020 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

utils/HelpGen/src/docripper.h

@@ -139,7 +139,7 @@ protected:
 
 public:
     RipperDocGen();
-    ~RipperDocGen();
+    virtual ~RipperDocGen();
 
     // should be called onece to set user-code provided,
     // parser for specific source code language

utils/HelpGen/src/ifcontext.h

@@ -78,7 +78,7 @@ public:
 public:
 
     spInterFileContext();
-    ~spInterFileContext();
+    virtual ~spInterFileContext();
 
     void AddFile( const wxString& fname, const wxString& content );