Bug#873329: love FTBFS with luajit 2.1

[Adrian Bunk]

Source: love
Version: 0.9.1-4
Severity: serious
Tags: buster sid

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/love.html

...
In file included from libraries/luasocket/libluasocket/udp.c:12:0:
libraries/luasocket/libluasocket/auxiliar.h:38:61: error: unknown type name 'luaL_reg'; did you mean 'luaL_Reg'?
 void auxiliar_newclass(lua_State *L, const char *classname, luaL_reg *func);
                                                             ^~~~~~~~
                                                             luaL_Reg