rtirq update - 2022 edition

Hi all!

Now that the (northern) Summer'22 is ending, an update to rtirq is out:

• Fixed grep warning stray \ before /.
• Replace obsolescent egrep for grep -E.
• Version 20220923.

Packages are here available as also from the repos:

Please note that the rtirq init-script/systemd-service makes sense only on real-time preemptive (PREEMPT_RT) or threadirqs enabled GNU/Linux kernels.

Enjoy!