When building wxGTK under Windows, some MSW-specific options can be defined but can't be implemented when using GTK, forcefully disable them. Also a few others that could be implemented but that don't work currently. Finally, forcefully enable Cairo support as wxGTK always needs it. Closes #14412. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71796 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775