games/freeorion: unbreak with boost 1.69 (post-Beta1)
In file included from combat/CombatEvent.cpp:1:
combat/CombatEvent.h:42:25: error: implicit instantiation of undefined template 'std::1::basic_string<char, std::1::char_traits<char>, std::__1::allocator<char> >'
virtual std::string CombatLogDetails(int viewing_empire_id) const ^
/usr/include/c++/v1/iosfwd:193:32: note: template is declared here
class _LIBCPP_TEMPLATE_VIS basic_string; ^
In file included from combat/CombatEvent.cpp:1:
combat/CombatEvent.h:43:14: error: implicit instantiation of undefined template 'std::1::basic_string<char, std::1::char_traits<char>, std::__1::allocator<char> >'
{ return std::string(""); } ^
/usr/include/c++/v1/iosfwd:193:32: note: template is declared here
class _LIBCPP_TEMPLATE_VIS basic_string; ^
PR: 232525
Obtained from: upstream