define (empty) ~wxDataObject everywhere: apparently it's needed for AIX and not only Darwin

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@17967 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/dataobj.h

@@ -22,9 +22,7 @@ class wxDataObject : public wxDataObjectBase
 {
 public:
     wxDataObject();
-#ifdef __DARWIN__
-    virtual ~wxDataObject() { }
-#endif
+    virtual ~wxDataObject();
 
     virtual bool IsSupportedFormat( const wxDataFormat& format, Direction dir = Get ) const;
 };

include/wx/gtk1/dataobj.h

@@ -22,9 +22,7 @@ class wxDataObject : public wxDataObjectBase
 {
 public:
     wxDataObject();
-#ifdef __DARWIN__
-    virtual ~wxDataObject() { }
-#endif
+    virtual ~wxDataObject();
 
     virtual bool IsSupportedFormat( const wxDataFormat& format, Direction dir = Get ) const;
 };

src/gtk/dataobj.cpp

@@ -158,6 +158,11 @@ wxDataObject::wxDataObject()
 {
 }
 
+wxDataObject::~wxDataObject()
+{
+    // dtor is empty but needed for Darwin and AIX -- otherwise it doesn't link
+}
+
 bool wxDataObject::IsSupportedFormat(const wxDataFormat& format, Direction dir) const
 {
     size_t nFormatCount = GetFormatCount(dir);

src/gtk1/dataobj.cpp

@@ -158,6 +158,11 @@ wxDataObject::wxDataObject()
 {
 }
 
+wxDataObject::~wxDataObject()
+{
+    // dtor is empty but needed for Darwin and AIX -- otherwise it doesn't link
+}
+
 bool wxDataObject::IsSupportedFormat(const wxDataFormat& format, Direction dir) const
 {
     size_t nFormatCount = GetFormatCount(dir);