Do not use pthread_setaffinity_np on s390x
Looks like it randomly causes a segfault
https://rubyci.s3.amazonaws.com/rhel_zlinux/ruby-master/log/20231025T093302Z.fail.html.gz
[11186/26148] TestNetHTTP_v1_2#test_set_form/home/chkbuild/build/20231025T093302Z/ruby/tool/lib/webrick/httprequest.rb:197: [BUG] Segmentation fault at 0x000003ff1ffff000 ruby 3.3.0dev (2023-10-25T07:50:00Z master 526292d9fe) [s390x-linux]
Do not use pthread_setaffinity_np on s390x
Looks like it randomly causes a segfault
https://rubyci.s3.amazonaws.com/rhel_zlinux/ruby-master/log/20231025T093302Z.fail.html.gz