* reverted VC6 hack in wxIf<>, using helper struct instead of typedef
didn't fix compilation, only caused the compiler to crash instead
of emitting semi-useful errors
* changed wxVector to use typedef for Ops class instead of privately
deriving from wxIf<...>::value; this is enough to make VC6 happy
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@51471 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775