PostgreSQL with JIT support enabled doesn't work with plv8. Hence, we'd
get an evaluation failure for each
`nixosTests.postgresql.postgresql.postgresql_jit_X`.
This should be restructured in the future (less VM tests for custom
extensions, but a single VM test for this case to cover). For now, we
should get this fix out and this is a good-enough approach.
(cherry picked from commit 68d9643388)
