[boost] [iostreams] regression - Missing include guard in boost/iostreams/device/mapped_file.hpp

Hi, Seems like the trunk@46692 commit, 25 june 2008, removed the include guard in boost/iostreams/device/mapped_file.hpp This breaks gcc43 compilation of sources directly including this header. Eg. http://www.mapnik.org/ trunk code. -- Bjørn