(text stolen from Nicola with minor amendments)

This PR has been brought to the attention of the TAC, to discuss a further improvement to the latest changes in the handling of the generated files (which are now committed read-only).

https://github.com/openssl/openssl/pull/28838

In a nutshell, the idea is to revert some of the currently generated headers to be completely static again, and have an `#include` directive to include a `.inc` file which is instead generated.

This is expected to minimize accidental writes to generated files, by isolating the "generated" part, and making the "main" headers/C files standalone and writable again.

This reuses the `.inc` mechanism that was already part of openssl practices.

This is likely going to be accepted and merged to `master`, and applied in a similar way to other files.

I'm going to ask the Corporation TAC has for an exception to backport this approach also to 3.6, after it is merged in `master`.

I'd like to sample the community feedback on this to provide our recommendation.

Choose the option(s) you favor.