link with armadillo
link with armadillo

It seems that it previous versions we didn't need to link with armadillo, since
everything is in the header file. In recent versions (for sure 4.4) we need to
link, otherwise we get error that arma_rng_cxx11_instance is missing

chatziko/libqif,chatziko/libqif,chatziko/libqif,chatziko/libqif