www/httest: enable only for lua <= 5.2
From lua_module.c:
#if ( LUA_VERSION_NUM == 501 )
failed = (lua_load(L, lua_get_line, reader, "@client") != 0 ||
lua_pcall(L, 0, LUA_MULTRET, 0) != 0);
#elif ( LUA_VERSION_NUM == 502 )
failed = (lua_load(L, lua_get_line, reader, "@client", NULL) != 0 ||
lua_pcall(L, 0, LUA_MULTRET, 0) != 0);
#else
#error this lua version is not supported
#endifPR: 220281