[Virtio-fs] [virtiofsd] MR opened: seccomp: Allow `SYS_sigreturn` for s390x

[virtiofs-bot at sinrega.org]

The virtiofsd currently crashes on s390x. This is because of a `sigreturn` system call.

This was originally reported and fixed, for the C version, by Marc Hartmayer <mhartmay at linux.ibm.com>
https://listman.redhat.com/archives/virtio-fs/2022-November/005292.html


Reported-by: Marc Hartmayer <mhartmay at linux.ibm.com>
Signed-off-by: German Maglione <gmaglione at redhat.com>
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https://gitlab.com/virtio-fs/virtiofsd/-/merge_requests/144