remove unused macro definitions
and limit others to the configurations which use them

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76280 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
remove unused member functions

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76281 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775