Remove unused function ntru_clone() (https://github.com/tbuktu/libntru/issues/17)
Remove unused function ntru_clone() (https://github.com/tbuktu/libntru/issues/17)

jquesnelle/libntru,jquesnelle/libntru,iblumenfeld/libntru,jl777/libntru,jl777/libntru,jquesnelle/libntru,iblumenfeld/libntru,iblumenfeld/libntru,jl777/libntru