No idea how could this work before but the presence of this code in the
non-GUI benchmark project prevented it from building. As it's not used anyhow,
just remove it.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74734 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775