Fix remaining freebsd-ci problems

[grembo]

Fixes #1536

[codecov-commenter]

Codecov Report

Base: 30.89% // Head: 30.84% // Decreases project coverage by -0.04% ⚠️

Coverage data is based on head (4a38383) compared to base (f452e4b).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1556      +/-   ##
==========================================
- Coverage   30.89%   30.84%   -0.05%     
==========================================
  Files          48       48              
  Lines       16598    16598              
  Branches     7906     7908       +2     
==========================================
- Hits         5128     5120       -8     
+ Misses       6106     6103       -3     
- Partials     5364     5375      +11     

Impacted Files	Coverage Δ
src/jobserver.rs	47.91% <0.00%> (-6.25%)	⬇️
src/cache/disk.rs	35.61% <0.00%> (-1.37%)	⬇️
src/compiler/gcc.rs	54.69% <0.00%> (-0.73%)	⬇️
src/cache/cache.rs	39.92% <0.00%> (-0.39%)	⬇️
src/mock_command.rs	52.43% <0.00%> (-0.38%)	⬇️
src/util.rs	35.17% <0.00%> (-0.33%)	⬇️
src/server.rs	31.94% <0.00%> (-0.32%)	⬇️
src/lru_disk_cache/mod.rs	41.03% <0.00%> (-0.31%)	⬇️
src/compiler/c.rs	38.44% <0.00%> (-0.23%)	⬇️
src/compiler/args.rs	62.23% <0.00%> (-0.18%)	⬇️
... and 5 more

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[sylvestre]

could you please add a comment here?

[grembo]

@sylvestre I'll clean it up a bit so it's clear how it works (please ignore the intermediate commit)

[grembo]

@sylvestre Code should be more obvious now.

Let's wait for CI builds to finish.