CI: Use llvm-tools-preview instead of external llvm-tools for symbol prefix testing

[briansmith]

See individual commit messages for details. This makes the script portable to all hosts and allows us to expand the symbol prefix checking to all tested targets. It also allows us to avoid incompatibilities between Apple nm and the toolchain's output.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3e50503) 96.02% compared to head (3cb66f5) 96.02%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1908   +/-   ##
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  Coverage   96.02%   96.02%           
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  Files         136      136           
  Lines       20776    20776           
  Branches      226      226           
=======================================
  Hits        19950    19950           
  Misses        792      792           
  Partials       34       34           

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[briansmith]

https://github.com/briansmith/ring/actions/runs/7515538763/job/20459551889 is a run that intentionally breaks symbol prefixing, to test this.

[briansmith]

It looks like the Windows builds are using PowerShell to run the shell script, and "passing" even though they aren't doing any work. :( I'll need to update this to force the use of mingw bash for windows.

[briansmith]

It looks like the Windows builds are using PowerShell to run the shell script, and "passing" even though they aren't doing any work. :( I'll need to update this to force the use of mingw bash for windows.

Well, after that, it seems more work is needed for Windows. Will split the Windows work off into a separate issue/PR.

[briansmith]

https://github.com/briansmith/ring/actions/runs/7516068245 is the new test run to make sure CI fails when an unprefixed symbol exists.

[briansmith]

https://github.com/briansmith/ring/actions/runs/7516194196 was the final test run that shows that the builds break when there is an unprefixed symbol.