bracketing for correct builds

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74604 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
wiring event loop callbacks

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74605 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
skip apple options

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74606 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775