Add basic testing of libunwind.a runtimes build #6417
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This builds the archive and checks relevant symbols are defined. While here, this refactors the runtimes test to share much more code between the different runtimes.
Last but not least, this adds a convenience type-def for the libunwind runtimes builder.
There is an inconsistency between how we spell things as
LibunwindorLibUnwind. We should canonicalize on the former as it matches the underscores and other things we will spell in this space. I'm not fixing existing spellings in this PR but will send follow-ups for those.