`test-link` fails randomly(?) on FreeBSD

[alexrp]

test
└─ test-link
   └─ link_test_cases
      └─ test-macho
         └─ test-section-boundary-symbols-native-macos-Debug-llvm-no-lld
            └─ CheckObject failure
error: InvalidMagicNumber
test
└─ test-link
   └─ link_test_cases
      └─ test-macho
         └─ test-weak-bind-x86_64-macos-Debug-llvm-no-lld
            └─ CheckObject failure
error: InvalidMagicNumber
test
└─ test-link
   └─ link_test_cases
      └─ test-macho
         └─ test-segment-boundary-symbols-native-macos-Debug-llvm-no-lld
            └─ CheckObject failure
error: InvalidMagicNumber

I suspect bugs in std.Build.Step.CheckObject.

[alexrp]

test
+- test-link
   +- link_test_cases
      +- test-macho
         +- test-undefined-flag-native-macos-Debug-llvm-no-lld
            +- CheckObject failure
error: InvalidMagicNumber