Comment 29 for bug 1891810

The fix for systemd's LP: #1918696 is not in the systemd xenial SRU since, as noted in that bug, systemd in xenial doesn't include upstream commit 469830d1426a91e0897c321fdc8ee428f0a750c1 which reworked the code to switch from seccomp_rule_add to seccomp_rule_add_exact. In this case systemd could handle lack of arch support itself, instead of allowing the 'not exact' seccomp syscall to just ignore the call due to lack of arch support.