Make it merely a warning for the precompile workload to fail

[oxinabox]

Cthulhu breaks easily on nightly, but not everyone uses all Cthulhu features.
So making it only a warning while we fix things may be useful.
In particular, right now Cthulu is broken on 1.11-alpha2, due to #343 though it is fixed at the head of the release-1.11 branch.

This in turn breaks Diffractor which has some Cthulhu integrations (reasonable) and also reuses some Cthulhu internals (not so reasonable).
But which actually works fine, its just #343

cf JuliaLang/PrecompileTools.jl#21

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (aecb743) to head (747b279).

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #562   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files           9       9           
  Lines        1545    1545           
======================================
  Misses       1545    1545           

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[aviatesk]

I'm in favor of this change, but still have a question: #343 is an issue that was fixed on the Cthulhu-side a while back. Why is it still leading to errors in the release-1.11 Julia?

[oxinabox]

I assume because a new alpha hasn't been cut since it was fixed?
I haven't actually tested the head of release-11, just alpha2 which is in juliaup

[aviatesk]

Did you get the same error as #342?
I built release-v1.11 Julia manually but I couldn't reproduce it on macOS on the latest Cthulhu master.

[oxinabox]

oh, now that i look closer no i didn't.
I got a similar but slightly different error.

I will open an issue

[aviatesk]

This change itself looks fine. Although this doesn't help us use Cthulhu if its precompilation segfaults.