wayland fails to run the testsuite on s390x since the update to 1.13. The
failing test is:

[   24s] connection-test: tests/connection-test.c:163: argument_from_va_list:
Assertion `args[5].n == 105' failed.
[   24s] test "argument_from_va_list":  signal 6, fail.


Another strange error, that does not result in a FAIL is this:
[   19s] PASS: os-wrappers-test
[   24s] User process fault: interruption code 003b ilc:3 in
sanity-test[80000000+9000]
[   24s] Failing address: 0000000000000000 TEID: 0000000000000400
[   24s] Fault in primary space mode while using user ASCE.
[   24s] AS:00000001f52f41c7 R3:0000000000000024 
[   24s] PASS: sanity-test