AGW on Phoenix: dummy datestamp fix for `FourWaySplitter`

git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@73432 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
AGW on Classic: dummy datestamp fix for `XLSGrid`

git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@73433 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775