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

src/gtk1/bitmap.cpp

@@ -228,7 +228,7 @@ class wxBitmapRefData: public wxObjectRefData
 {
 public:
     wxBitmapRefData();
-    ~wxBitmapRefData();
+    virtual ~wxBitmapRefData();
 
     GdkPixmap      *m_pixmap;
     GdkBitmap      *m_bitmap;

src/gtk1/colour.cpp

@@ -47,7 +47,7 @@ public:
         m_hasPixel = data.m_hasPixel;
     }
 
-    ~wxColourRefData()
+    virtual ~wxColourRefData()
     {
         FreeColour();
     }

src/gtk1/cursor.cpp

@@ -36,7 +36,7 @@ class wxCursorRefData: public wxObjectRefData
   public:
 
     wxCursorRefData();
-    ~wxCursorRefData();
+    virtual ~wxCursorRefData();
 
     GdkCursor *m_cursor;
 };

src/gtk1/region.cpp

@@ -63,7 +63,7 @@ public:
         m_region = gdk_regions_union(wxGdkRegion(), refData.m_region);
     }
 
-    ~wxRegionRefData()
+    virtual ~wxRegionRefData()
     {
         if (m_region)
             gdk_region_destroy( m_region );