[boost] [test] mingw 4.5, 4.6, compile failure with trunk

..\..\../boost/test/utils/runtime/config.hpp: In function 'void boost::runtime::putenv_impl(boost::runtime::cstring, boost::runtime::cstring)': ..\..\../boost/test/utils/runtime/config.hpp:95:51: error: 'putenv' was not declared in this scope This is preventing me from testing other Boost libraries that use Boost.Test:-( --Beman