lb/LuaHandler: use luaL_Reg instead of the deprecated luaL_reg
lb/LuaHandler: use luaL_Reg instead of the deprecated luaL_reg

The old name was removed in LuaJIT 2.1.

CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy