[coreboot] [RFC] Common license header guideline should prefer GPLv2+ over GPLv2 only

[Alex G.]

I think this would be a good move for interoperability, so that GPLv3
projects (e.g. SeaBIOS) may take code from coreboot where needed (e.g.
device drivers). I'm strictly talking about listing the preferred
license; it's still up to contributors whether they want v2 or v2+.

[1] Listed GPLv2+ as preferred, but it was recently changed without any
explanation. Stefan, do you have more details on that?

Alex

[1] https://www.coreboot.org/Development_Guidelines#Common_License_Header