Well the answer to the new fails is that we are now "too new" in my
tests I used kernel 5.3 and this is what Focal has. But the final fix
used 5.4-rc levels which brought in all the time64 things.

linux-libc-dev:amd64      5.3.0-21.22

5.3 already has the NR definitions like
/usr/include/x86_64-linux-gnu/bits/syscall.h:182:#ifdef __NR_clock_gettime64

But the updated seccomp code added things like:
src/arch-mips64-syscalls.c
 626 +»··{ "clock_settime64", __PNR_clock_settime64 },                          
      

Usually there are compat defines inside seccomp include/seccomp.h
But the timers are not there.

So without the timers defined => tests fail re-resolving those
with them defined => build fails missing some other part of the definition.

What we overall need seems instead to be the slightly bigger set of:
44113f30 arch: add support for io-uring related system calls in kernel 5.1
0db8babb api: stop defining __NR_x values for syscalls that don't exist
80177ff2 build: ship seccomp-syscalls.h
be65b26b arch: update the internal syscall tables to Linux v5.4-rc4

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https://bugs.launchpad.net/bugs/1849785

Title:
  FTBFS on i386/ppc64/s390x (Eoan+Focal)

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