In d88d727143 (ci: drop linux-clang job, 2023-06-01) we have dropped the
"linux-clang" job because another job already uses Clang anyway. But we
forgot to also drop the logic in "ci/run-build-and-tests.sh", so we now
have some unused logic in there.
Drop it.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>