Support `CONFIG_MODVERSIONS`

[ojeda]

[stappersg]

Adding string ERROR: modpost: too long symbol
and mailinglist Rust-for-Linux archive link.

The idea is to provide some context to this issue. (And yes, I took the risk of adding noise (instead of context))

[GuilhermeGiacomoSimoes]

@ojeda
We have anybody working on MODVERSIONS support for rust modules ?
We have any discussion about this (zulipchat, mailing list...) ?