[S] Change in flashrom[main]: Make sleep threshold for delays configurable

[Peter Marheine (Code Review)]

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

Hello Anastasia Klimchuk, Thomas Heijligen, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/flashrom/+/81606?usp=email

to look at the new patch set (#4).

Change subject: Make sleep threshold for delays configurable
......................................................................

Make sleep threshold for delays configurable

This allows the minimum time that default_delay() will choose to sleep
for instead of polling to be configured at build-time. The default
remains unchanged at 100 milliseconds for now.

The test's correctness has been checked by testing with minimum sleep
time left at its default and set to a non-default value smaller than 100
microseconds (both pass without sleeping, verified with strace) and with
the minimum sleep time set to 0 (causing the test to be skipped). The
configured value from the macro needs to be stored in a const to avoid
-Werror=type-limits errors when configured to be zero.

Change-Id: Ida96e0816ac914ed69d6fd82ad90ebe89cdef1cc
Signed-off-by: Peter Marheine 
---
M Makefile
M meson.build
M meson_options.txt
M tests/udelay.c
M udelay.c
M udelay_dos.c
6 files changed, 36 insertions(+), 10 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/06/81606/4