fix luajittex deps, and autoreconf complaints about duplicate targets


git-svn-id: https://foundry.supelec.fr/svn/luatex/branches/experimental@4763 0b2b3880-5936-4365-a048-eb17d2e5a6bf
buildjit may as well build luatex itself also


git-svn-id: https://foundry.supelec.fr/svn/luatex/branches/experimental@4764 0b2b3880-5936-4365-a048-eb17d2e5a6bf