FreeBSD 13.2 test failures on OCaml 4.14 and 5.0

[tmcgilchrist]

diff --git a/_build/default/test/e2e/alcotest/source_code_position/with-position.expected b/_build/default/test/e2e/alcotest/source_code_position/with-position.processed
index 34697b9..9daac99 100644
--- a/_build/default/test/e2e/alcotest/source_code_position/with-position.expected
+++ b/_build/default/test/e2e/alcotest/source_code_position/with-position.processed
@@ -1,60 +1 @@
-Testing `First suite'.
-This run has ID `<uuid>'.
-
-  [FAIL]        to_test          0   capitalise.
-  [FAIL]        to_test          1   double all.
-
-┌──────────────────────────────────────────────────────────────────────────────┐
-│ [FAIL]        to_test          0   capitalise.                               │
-└──────────────────────────────────────────────────────────────────────────────┘
-ASSERT strings
-File "test/e2e/alcotest/source_code_position/test_source_code_position.ml", line 24, character 2:
-FAIL strings
-
-   Expected: `"A"'
-   Received: `"B"'
-
-<stacktrace>
-
-Logs saved to `<build-context>/_build/_tests/<test-dir>/to_test.000.output'.
- ──────────────────────────────────────────────────────────────────────────────
-
-
-┌──────────────────────────────────────────────────────────────────────────────┐
-│ [FAIL]        to_test          1   double all.                               │
-└──────────────────────────────────────────────────────────────────────────────┘
-ASSERT int lists 1
-File "test/e2e/alcotest/source_code_position/test_source_code_position.ml", line 28, character 2:
-FAIL int lists 1
-
-   Expected: `[1]'
-   Received: `[2; 2; 4; 6]'
-
-<stacktrace>
-
-Logs saved to `<build-context>/_build/_tests/<test-dir>/to_test.001.output'.
- ──────────────────────────────────────────────────────────────────────────────
-
-Full test results in `<build-context>/_build/_tests/<test-dir>'.
-2 failures! in <test-duration>s. 2 tests run.Forging ahead regardless!
-
-Testing `Second suite'.
-This run has ID `<uuid>'.
-
-  [OK]          Ωèone          0   Passing test 1.
-  [FAIL]        Ωèone          1   Failing test.
-  [OK]          Ωèone          2   Passing test 2.
-
-┌──────────────────────────────────────────────────────────────────────────────┐
-│ [FAIL]        Ωèone          1   Failing test.                               │
-└──────────────────────────────────────────────────────────────────────────────┘
-ASSERT This was never going to work...
-FAIL This was never going to work...
-<stacktrace>
-
-Logs saved to `<build-context>/_build/_tests/<test-dir>/U+03A9U+00E8one.001.output'.
- ──────────────────────────────────────────────────────────────────────────────
-
-Full test results in `<build-context>/_build/_tests/<test-dir>'.
-1 failure! in <test-duration>s. 3 tests run.
-Fatal error: exception Alcotest_engine__Core.Make(P)(M).Test_error

See https://github.com/mirage/alcotest/runs/14753523375 and https://ocaml.ci.dev/github/mirage/alcotest/commit/7c997d1d48ae6e734512bc92144593e11b189d8e/variant/freebsd-4.14.1_opam-2.1 for a full test log.