protobuf: fix URL.

Closes #34711.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
ssh-copy-id: 6.7p1

Closes #34714.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
ssh-copy-id: update 6.7p1 bottle.
Remove {start,stop}doc as we're using Yard now.
eigen: add test
eigen: update 3.2.2 bottle.