Export global only if LUA_COMPAT_MODULE defined.

src/tcp.c

@@ -107,7 +107,11 @@ int tcp_open(lua_State *L)
     auxiliar_add2group(L, "tcp{client}", "tcp{any}");
     auxiliar_add2group(L, "tcp{server}", "tcp{any}");
     /* define library functions */
+#if LUA_VERSION_NUM > 501 && !defined(LUA_COMPAT_MODULE)
+    luaL_setfuncs(L, func, 0);
+#else
     luaL_openlib(L, NULL, func, 0);
+#endif
     return 0;
 }