compiling error on ubuntu 18.04

[hashbangtech]

hello
compiling error on ubuntu 18.04.
ipt-netflow/ipt_NETFLOW.c: In function ‘netflow_work_fn’:
ipt-netflow/ipt_NETFLOW.c:4504:11: error: implicit declaration of function ‘__smp_processor_id’; did you mean ‘smp_processor_id’? [-Werror=implicit-function-declaration]
wk_cpu = __smp_processor_id();
^~~~~~~~~~~~~~~~~~
smp_processor_id
cc1: some warnings being treated as errors
thanks

[svlobanov]

ubuntu 18.04 is EoL so there is no reason to use it

[gnought]

This issue will be fixed after applying PR #217