To reproduce:

* Install fresh Fedora 34 VM
* Compile Bitcoin Core and run `./test/functional/p2p_dns_seeds.py`
{__NR_rt_sigsuspend, "rt_sigsuspend"},
    {__NR_rt_sigtimedwait, "rt_sigtimedwait"},
    {__NR_rt_tgsigqueueinfo, "rt_tgsigqueueinfo"},
    {__NR_sched_getaffinity, "sched_getaffinity"},
    {__NR_sched_getattr, "sched_getattr"},
    {__NR_sched_getparam, "sched_getparam"},
    {__NR_sched_get_priority_max, "sched_get_priority_max"},
    {__NR_sched_get_priority_min, "sched_get_priority_min"},
    {__NR_sched_getscheduler, "sched_getscheduler"},
    {__NR_sched_rr_get_interval, "sched_rr_get_interval"},
    {__NR_sched_setaffinity, "sched_setaffinity"},
    {__NR_sched_setattr, "sched_setattr"},
    {__NR_sched_setparam, "sched_setparam"},
    {__NR_sched_setscheduler, "sched_setscheduler"},
    {__NR_sched_yield, "sched_yield"},
    {__NR_seccomp, "seccomp"},
    {__NR_security, "security"},
    {__NR_select, "select"},
    {__NR_semctl, "semctl"},
    {__NR_semget, "semget"},
    {__NR_semop, "semop"},
    {__NR_semtimedop, "semtimedop"},
    {__NR_sendfile, "sendfile"},
    {__NR_sendmmsg, "sendmmsg"},
    {__NR_sendmsg, "sendmsg"},
    {__NR_sendto, "sendto"},
    {__NR_setdomainname, "setdomainname"},
    {__NR_setfsgid, "setfsgid"},
    {__NR_setfsuid, "setfsuid"},
    {__NR_setgid, "setgid"},