adding empty base class implementation for OnNextIteration, call from OSXDoRun, allowing console event loop to override

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76223 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
removing superfluous semicolon

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76224 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775