Function alloc_newuserdata

3rdparty/lua/sol/sol.hpp:10956–10962

		using unique_tag = detail::inheritance_unique_cast_function;

		inline void* alloc_newuserdata(lua_State* L, std::size_t bytesize) {
#if SOL_LUA_VERSION_I_ >= 504
			return lua_newuserdatauv(L, bytesize, 1);
#else
			return lua_newuserdata(L, bytesize);
#endif
		}

		constexpr std::uintptr_t align(std::size_t alignment, std::uintptr_t ptr, std::size_t& space) {
			// this handles arbitrary alignments...