[libosmocore] testsuite: 61 87 failed on s390x

Hi, I built libosmocore head (commit 84dcf73625513af44e711b2c99e21ee2c33b7eff at that time) on Fedora 43 (rawhide) and on s390x 4 tests failed. Iit's s390x running in qemu on x86_64, but it also fails on native s390 - there I saw failures of tests 25 26 69 90 (unfortunately I don't have the log from the native run). So probably more tests can coredump, to see all the problematic tests, it would probably require running through the valgrind. I am reporting it according to the provided instructions thanks & regards Jaroslav