bug in test_construction.cpp

[GregKon]

Hi Robert

There is small issue what cause compilation error on non gcc/msvc compilers

in test_construction.cpp line 156 you create
using test_types = mp_unique<
and include test_values.hpp where in line 66 also create the same alias name:
using test_types = boost::mp11::mp_list<

which alias shall be used?