corrected warnings when compiling with -Wall -W

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

src/mac/colour.cpp

@@ -52,6 +52,7 @@ wxColour::wxColour (unsigned char r, unsigned char g, unsigned char b)
 }
 
 wxColour::wxColour (const wxColour& col)
+    : wxObject()
 {
     m_red = col.m_red;
     m_green = col.m_green;
@@ -125,4 +126,4 @@ void wxColour::Set( const WXCOLORREF* color )
     m_red = col->red>>8 ;
     m_blue = col->blue>>8 ;
     m_green = col->green>>8 ;
-}
+}