Add declaration of luaopen_zlib

git-svn-id: http://svn.net-core.org/repos/t-engine4@2943 51575b47-30f0-44d4-a5cc-537603b46e54

src/lua_externs.h

@@ -14,6 +14,7 @@ int luaopen_struct(lua_State *L);
 int luaopen_noise(lua_State *L);
 int luaopen_lxp(lua_State *L);
 int luaopen_md5_core (lua_State *L);
+int luaopen_zlib (lua_State *L);
 
 void create_particles_thread();
 void thread_particle_new_keyframes(int nb_keyframes);