[config] evc4 port

[vividos]

This patch is a port for evc3/4 targeting Windows CE.
Reason for the changes in auto_link.hpp: STLport with
evc4 cannot be compiled in _STLP_DEBUG mode; the
compiler issues wrong ARM code and _STLP_DEBUG mode
cannot be used with evc4 ARM. I also introduced a new
file wince.hpp in boost/config/platform/, since the
defines in the _WIN32_WCE part got too big.