[Bug ada/70017] c52103x and c52104x test failure on s390x

[vogt at linux dot vnet.ibm.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70017

--- Comment #6 from Dominik Vogt <vogt at linux dot vnet.ibm.com> ---
S390 does have stack checking support, so the question is really just whether
Ada has extra requirements.