fix for recent odin versions and add lua_newlib function

[rivten]

I did not test the change on Mac and Windows.

However, with the change, now you can build a SO file that can be loaded from the Lua interpreter standalone

package main

import "core:fmt"
import lua "odin-lua"

swap :: proc "c" (L: ^lua.lua_State) -> i32 {
    arg1 := lua.luaL_checknumber(L, 1)
    arg2 := lua.luaL_checknumber(L, 2)

    lua.lua_pushnumber(L, arg2)
    lua.lua_pushnumber(L, arg1)
    
    return 2
}

@(export)
luaopen_t :: proc "c" (L: ^lua.lua_State) -> i32 {
    lua.luaL_newlib(L, []lua.luaL_Reg {
        {"swap", swap},
        {nil, nil},
    })
    return 1;
}