[M] Change in flashrom[main]: Remove dependency on C23 __has_include()

[Alexander Goncharov (Code Review)]

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

Alexander Goncharov has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/77089?usp=email )

Change subject: Remove dependency on C23 __has_include()
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Patch Set 3:

(3 comments)

Patchset:

PS1:
> I totally agree with all your and Alexander's propositions, however have no knowledge of how to test […]

Well done, thank you!

Please try using `cc.check_header` in Meson to check whether the specified header is usable. You can find an example by searching for `cc.check_header('sys/utsname.h')`. I assume that all tests will then be verified by Jenkins.

File Makefile:

https://review.coreboot.org/c/flashrom/+/77089/comment/5243b176_7772b912 :
PS3, Line 209: 
drop extra line

https://review.coreboot.org/c/flashrom/+/77089/comment/b87050e5_3eb13c3b :
PS3, Line 240: 
drop extra line