[Dwarf-discuss] Proposal: Add versioning scheme for Fortran

[Adrian Prantl]

# Add versioning scheme for Fortran

## Background

The list of languages at https://dwarfstd.org/languages-v6.html does not list a versioning scheme for Fortran, but we have DWARF 5 language constants for FORTRAN77 through Fortran08.

## Proposed Changes

Augment the table of language encodings to add `YYYY` to Fortran as a version scheme.

## Dependencies

Issue 210419.1 

## References

https://dwarfstd.org/languages-v6.html