fixed the Lua stack

git-svn-id: https://foundry.supelec.fr/svn/luatex/trunk@5030 0b2b3880-5936-4365-a048-eb17d2e5a6bf
fixed wrong procedure keyword

git-svn-id: https://foundry.supelec.fr/svn/luatex/trunk@5031 0b2b3880-5936-4365-a048-eb17d2e5a6bf
fixed a bug with braces

git-svn-id: https://foundry.supelec.fr/svn/luatex/trunk@5033 0b2b3880-5936-4365-a048-eb17d2e5a6bf
fixed a seg. fault with zziplib and MINGW

git-svn-id: https://foundry.supelec.fr/svn/luatex/trunk@5034 0b2b3880-5936-4365-a048-eb17d2e5a6bf
LuaTeX: Adoid MINGW64 compiler warnings (redefining _WIN32_WINNT) (from TL dev)

git-svn-id: https://foundry.supelec.fr/svn/luatex/trunk@5037 0b2b3880-5936-4365-a048-eb17d2e5a6bf