corrected warnings when compiling with -Wall -W

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@15412 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/brush.h

@@ -40,7 +40,9 @@ public:
     wxBrush( const wxBitmap &stippleBitmap );
     ~wxBrush();
     
-    wxBrush( const wxBrush &brush ) { Ref(brush); }
+    wxBrush( const wxBrush &brush )
+        : wxGDIObject()
+        { Ref(brush); }
     wxBrush& operator = ( const wxBrush& brush ) { Ref(brush); return *this; }
     
     bool Ok() const { return m_refData != NULL; }

include/wx/gtk/colour.h

@@ -49,7 +49,9 @@ public:
     wxColour( const wxString &colourName ) { InitFromName(colourName); }
     wxColour( const char *colourName ) { InitFromName(colourName); }
 
-    wxColour( const wxColour& col ) { Ref(col); }
+    wxColour( const wxColour& col )
+        : wxGDIObject()
+        { Ref(col); }
     wxColour& operator = ( const wxColour& col ) { Ref(col); return *this; }
 
     ~wxColour();

include/wx/gtk/pen.h

@@ -45,7 +45,9 @@ public:
     wxPen( const wxColour &colour, int width, int style );
     ~wxPen();
     
-    wxPen( const wxPen& pen ) { Ref(pen); }
+    wxPen( const wxPen& pen )
+        : wxGDIObject()
+        { Ref(pen); }
     wxPen& operator = ( const wxPen& pen ) { Ref(pen); return *this; }
     
     bool Ok() const { return m_refData != NULL; }

include/wx/gtk/region.h

@@ -73,7 +73,9 @@ public:
     wxRegion( size_t n, const wxPoint *points, int fillStyle = wxODDEVEN_RULE );
     ~wxRegion();
 
-    wxRegion( const wxRegion& region ) { Ref(region); }
+    wxRegion( const wxRegion& region )
+        : wxGDIObject()
+        { Ref(region); }
     wxRegion& operator = ( const wxRegion& region ) { Ref(region); return *this; }
 
     bool Ok() const { return m_refData != NULL; }