removed overloaded virtual InitWith() methods, keep just a single InitRGBA()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41123 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/colour.cpp

@@ -112,7 +112,8 @@ bool wxColour::operator == ( const wxColour& col ) const
            refData->m_blue == that_refData->m_blue;
 }
 
-void wxColour::InitWith( unsigned char red, unsigned char green, unsigned char blue )
+void wxColour::InitRGBA(unsigned char red, unsigned char green, unsigned char blue,
+                        unsigned char WXUNUSED(alpha))
 {
     UnRef();