configure: Allow --enable-seccomp on s390x, too

libseccomp supports s390x since version 2.3.0, and I was able to start
a VM with "-sandbox on" without any obvious problems by using this patch,
so it should be safe to allow --enable-seccomp on s390x nowadays, too.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-Id: <1505385363-27717-1-git-send-email-thuth@redhat.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Eduardo Otubo <otubo@redhat.com>
Acked-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

configure

@@ -2025,7 +2025,7 @@ if test "$seccomp" != "no" ; then
     arm|aarch64)
         libseccomp_minver="2.2.3"
         ;;
-    ppc|ppc64)
+    ppc|ppc64|s390x)
         libseccomp_minver="2.3.0"
         ;;
     *)