[L] Change in flashrom[main]: udelay: only use OS time for delays, except on DOS

[Peter Marheine (Code Review)]

Attention is currently required from: Anastasia Klimchuk, Brian Norris, Thomas Heijligen.

Peter Marheine has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/81545?usp=email )

Change subject: udelay: only use OS time for delays, except on DOS
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Patch Set 9:

(1 comment)

File tests/udelay.c:

https://review.coreboot.org/c/flashrom/+/81545/comment/2a8e63e9_626a9928 :
PS9, Line 41: This test could fail spuriously on a heavily-loaded system
> Brian, you have good points. Thank you for sharing your valuable experience! […]

We'd have to write the test differently to handle a potential infinite loop, since the test only checks elapsed time once the delay function returns. I think we'll leave it as-is for now, and consider adjustment later if it seems too flaky.