small patch by Akira


git-svn-id: https://foundry.supelec.fr/svn/luatex/trunk@4641 0b2b3880-5936-4365-a048-eb17d2e5a6bf
switch to static arrays to prevent stack overflow on systems with a small call stack default


git-svn-id: https://foundry.supelec.fr/svn/luatex/trunk@4642 0b2b3880-5936-4365-a048-eb17d2e5a6bf