MFH: r561356

databases/kyotocabinet: fix build on GCC architectures

kcdirtest.cc: In member function 'virtual const char* procorder(const char*, int64_t, int32_t, bool, int32_t, bool, int32_t, int32_t, bool)::VisitorIterator::visit_full(const char*, size_t, const char*, size_t, size_t*)':
kcdirtest.cc:1030: error: 'class std::set<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >' has no member named 'emplace'
kcdirtest.cc: In member function 'virtual const char* procorder(const char*, int64_t, int32_t, bool, int32_t, bool, int32_t, int32_t, bool)::VisitorCursor::visit_full(const char*, size_t, const char*, size_t, size_t*)':
kcdirtest.cc:1095: error: 'class std::set<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >' has no member named 'emplace'