[M] Change in flashrom[master]: tests: Emulate multithreading environment for unit tests

[Anastasia Klimchuk (Code Review)]

Attention is currently required from: Thomas Heijligen, Peter Marheine.

Anastasia Klimchuk has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/74157 )

Change subject: tests: Emulate multithreading environment for unit tests
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Patch Set 5:

(1 comment)

Patchset:

PS2:
> Yes, I'd prefer to always create a thread and get rid of the `__isthreaded` poke for other BSDs. […]

Finally, it seems like we got to the other side of rabbit hole! :) I tested the version without pre-processor conditionals, it works!
One more patch is needed though, I pushed it as a previous one for the chain CB:74202 but otherwise looks like that's it?

Peter thank you so much, your help is invaluable!