For ppc64le and s390x, the build and the build-tools jobs are using different buildroots with different compiler _versions_. This is asking for trouble, so fix it before anything important gets broken. AC: - use correct version of cross compilers for CS/RHEL 8/9/10 - docs updated at https://cki-project.org/docs/cki/operations/cross-compiler-updates/ Jira: [CKI-7064](https://issues.redhat.com/browse/CKI-7064)