fix gcc warnings about not calling the base class ctors (replaces patch 1962992)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@53631 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/dataview.h

@@ -478,6 +478,7 @@ public:
         : m_text(text), m_icon(icon)
     { }
     wxDataViewIconText( const wxDataViewIconText &other )
+        : wxObject()
     { m_icon = other.m_icon; m_text = other.m_text; }
 
     void SetText( const wxString &text ) { m_text = text; }

src/msw/palette.cpp

@@ -55,6 +55,7 @@ public:
     }
 
     wxPaletteRefData(const wxPaletteRefData& data)
+        : wxGDIRefData()
     {
         Init();