Allow passing a PIN via the SK API (API major crank) and let the
ssh-sk-helper API follow.
Also enhance the ssh-sk-helper API to support passing back an error
code instead of a complete reply. Will be used to signal "wrong PIN",
etc.
feedback and ok markus@
OpenBSD-Commit-ID: a1bd6b0a2421646919a0c139b8183ad76d28fb71
This means that ssh-keygen no longer needs to link against ssh-sk-helper, and
only ssh-sk-helper needs libfido2 and /dev/uhid* access;
feedback & ok markus@
OpenBSD-Commit-ID: 9464233fab95708d2ff059f8bee29c0d1f270800