wxOSX doesn't provide a native spinner+text control so it used a generic
implementation of wxSpinCtrl but a different one to the version found in
src/generic/spinctlg.cpp.
Just use the real generic version instead, it doesn't make sense to have two
different versions of the same generic control.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72413 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
