[M] Change in flashrom[main]: libflashrom: Update the API for progress callback

[Peter Marheine (Code Review)]

Attention is currently required from: Anastasia Klimchuk, Richard Hughes, Sergii Dmytruk.

Peter Marheine has posted comments on this change by Anastasia Klimchuk. ( https://review.coreboot.org/c/flashrom/+/86031?usp=email )

Change subject: libflashrom: Update the API for progress callback
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Patch Set 1:

(1 comment)

File include/libflashrom.h:

https://review.coreboot.org/c/flashrom/+/86031/comment/e2721600_738a07fa?usp... :
PS1, Line 93: __attribute__((deprecated("Use flashrom_set_progress_callback_v1 instead")));
This might need some preprocessor guards for platforms where the compiler doesn't support this attribute. Looks like gcc added support for this [around 2009](https://gcc.gnu.org/pipermail/gcc-patches/2009-May/261308.html), but there are probably still some platforms we support where the usual compilers don't understand this.

Apparently `[[deprecated]]` is standard since C23 as well, but is probably much too new to use right now.