[boost] [date_time] time_zone_base.hpp should #include <sstream>

From: Boris Gubenko (Boris.Gubenko_at_[hidden])
Date: 2007-02-23 05:43:24

boost/date_time/time_zone_base.hpp uses std::basic_ostringstream without
including standard library header <sstream>. Because of the missing header,
date_time library test testlocal_time fails to compile on HP-UX/ia64 which
uses Rogue Wave library 2.2.

Can '#include <sstream>' be added to time_zone_base.hpp, in both 1.34 and
HEAD?

If not, can date_time library test testlocal_time be marked expected
failure on HP-UX/ia64 (toolset "acc") ?

Thanks,
  Boris