check_once_cc_get_cred_version
check_once_cc_get_cred_version(context, ccache, CC_CRED_V5, CC_NOERROR, "v5 creds");
cc_result check_once_cc_get_cred_version(apiCB *context, ccache_p *ccache, cc_int32 expected_cred_vers, cc_int32 expected_err, const char *description);