autopkgtest fails in hirsute on ppc64el

[Balint Reczey]

https://autopkgtest.ubuntu.com/packages/r/r-cran-clubsandwich/hirsute/ppc64el

https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-hirsute/hirsute/ppc64el/r/r-cran-clubsandwich/20201120_015034_241bc@/log.gz
...
>
> test_check("clubSandwich")
── 1. Failure: lme agrees with gls (@test_lme_2level.R#137) ───────────────────
`CR_lme` not equivalent to `CR_gls`.
Component 5: Mean relative difference: 3.207442e-06

Error: testthat unit tests failed
══ testthat results ═══════════════════════════════════════════════════════════
[ OK: 764 | SKIPPED: 18 | WARNINGS: 0 | FAILED: 1 ]
1. Failure: lme agrees with gls (@test_lme_2level.R#137)

Execution halted
autopkgtest [01:47:13]: test run-unit-test: -----------------------]
run-unit-test FAIL non-zero exit status 1
...