38d1d10465
sysext DDI cannot carry an os-release file, but have to carry an extension-release file. But so far, this was only used to match the sysext DDI with the base DDI/rootdir. It is also useful to describe the sysext DDI itself, just like we do in os-release. So document that the same fields used in os-release can also be added to an extension-release, with the 'SYSEXT_' prefix, and in that case they are understood to define the sysext DDI itself, rather than for matching purposes.
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