[boost] config/auto_link undefs

From: Gennadiy Rozental (gennadiy.rozental_at_[hidden])
Date: 2003-10-27 04:30:46

I think that boost/config/auto_link.hpp should undef symbols that could've
been defined outside of
#if defined(_MSC_VER) || defined(__BORLANDC__)

Gennadiy.