Created attachment 201688 [details]
Patch file generated with svn diff
The option Protocol is now obsolete.
The value of Protocol in ssh_config has indeed been changed from 2,1 to 2 but that option was deleted thereafter, when support of SSH protocol version 1 was eventually dropped.
No functional change (obsolete option was mentioned in a comment)
I just wrote to the OpenSSH developers' public list with a reference to this problem report.
Applied upstream, will appear in release 8.0.