Filter out linker warnings on ghc 7.8
Filter out linker warnings on ghc 7.8

mrkkrp/stack,martin-kolinek/stack,martin-kolinek/stack,anton-dessiatov/stack,mrkkrp/stack,MichielDerhaeg/stack,MichielDerhaeg/stack,juhp/stack,juhp/stack,anton-dessiatov/stack