koops: recognize s390x and ppc64 stacktraces

Related to rhbz#1040900.

Signed-off-by: Martin Milata <mmilata@redhat.com>
Merge pull request #145 from abrt/rhbz1040900-ppc-s390-koops

koops: recognize s390x and ppc64 stacktracesRelated to rhbz#1040900.Signed-off-by: Martin Milata <mmilata@redhat.com>