Tumbleweed changed location of krb5-config
krb5-config is now in /usr/bin/ and we should detect it automatically.
Failure: https://gitlab.isc.org/isc-projects/bind9/-/jobs/1106502#L840.
See revision 237 at https://build.opensuse.org/package/revisions/network/krb5.
Edited by Michal Nowak