Already used in `vtls.h`. Prefer this curl-namespaced name over the
unprefixed `SHA256_DIGEST_LENGTH`. The latter is also defined by TLS
backends with a potential to cause issues.
Also stop relying on externel headers setting this constant. It's
already defined in `vtls.h` on curl's behalf, do this also for `lib`.
Cherry-picked from #14495Closes#14513
- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- saves us from pointless churn
- git keeps history for us
- the year range is kept in COPYING
checksrc is updated to allow non-year using copyright statements
Closes#10205
Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the file
`.reuse/dep5`.
This commit also adds a Github workflow to check pull requests and adapts
copyright.pl to the changes.
Closes#8869
