adapting const parameter convention

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76732 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
remove dependency from former cocoa port

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76733 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775