Throw specifier missing on exception_clone

[anonymous]

I get a build error when cross compiling Boost because boost::exception_detail::exception_clone is instantiated with a template parameter of boost::exception_detail::error_info_injector. This causes it to inherit from error_info_injector, which has a throw() specifier on its destructor. Since exception_clone doesn't have an explicit destructor, GCC complains about the missing throw() specifier.

I fixed the problem with the attached patch - no idea if it's the correct solution, though.