[coreboot-gerrit] Change in coreboot[master]: docs/coding_style: Clarify use of GCC extensions

[David Hendricks (Code Review)]

Attention is currently required from: Arthur Heymans, Hung-Te Lin, Nico Huber, Paul Menzel, Julius Werner.
David Hendricks has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/63660 )

Change subject: docs/coding_style: Clarify use of GCC extensions
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Patch Set 2: Code-Review+1

(1 comment)

Patchset:

PS2: 
Is there value in a section on what to do if a developer encounters a GCC extension that their compiler of choice doesn't support? "Wrap your code in a preprocessor guard and let us know via the mailing list if it gets too messy" or something to that effect?

I'm fine with saying that GCC is the officially-supported compiler of coreboot, but predicting the future is hard and there might be good reason to use another compiler in certain cases.