Since r68621 dataview.cpp didn't compile anymore (at least with wxOSX-Carbon). Fixed by explicitly using wxDataViewItem's void * constructor in a few cases.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@68632 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775