corrections for wxGtk compilation under Darwin/Mac OS X

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@11132 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/dataobj.h

@@ -22,6 +22,9 @@ class wxDataObject : public wxDataObjectBase
 {
 public:
     wxDataObject();
+#ifdef __DARWIN__
+    virtual ~wxDataObject() { }
+#endif
     
     virtual bool IsSupportedFormat( const wxDataFormat& format, Direction dir = Get ) const;
 };

include/wx/gtk/popupwin.h

@@ -27,6 +27,9 @@ class wxPopupWindow: public wxPopupWindowBase
 {
 public:
     wxPopupWindow() { }
+#ifdef __DARWIN__
+    virtual ~wxPopupWindow() { }
+#endif
     
     wxPopupWindow(wxWindow *parent) { (void)Create(parent); }
     bool Create(wxWindow *parent, int flags = wxBORDER_NONE);

include/wx/gtk1/dataobj.h

@@ -22,6 +22,9 @@ class wxDataObject : public wxDataObjectBase
 {
 public:
     wxDataObject();
+#ifdef __DARWIN__
+    virtual ~wxDataObject() { }
+#endif
     
     virtual bool IsSupportedFormat( const wxDataFormat& format, Direction dir = Get ) const;
 };

include/wx/gtk1/popupwin.h

@@ -27,6 +27,9 @@ class wxPopupWindow: public wxPopupWindowBase
 {
 public:
     wxPopupWindow() { }
+#ifdef __DARWIN__
+    virtual ~wxPopupWindow() { }
+#endif
     
     wxPopupWindow(wxWindow *parent) { (void)Create(parent); }
     bool Create(wxWindow *parent, int flags = wxBORDER_NONE);

include/wx/popupwin.h

@@ -29,6 +29,9 @@ class WXDLLEXPORT wxPopupWindowBase : public wxWindow
 {
 public:
     wxPopupWindowBase() { }
+#ifdef __DARWIN__
+    virtual ~wxPopupWindowBase() { }
+#endif
 
     // create the popup window
     //