Log Message:
Remve "Don't delete the last entry" from MASTER_SITES.

It's not available.
ftp://ftp.belnet.be/pub/OpenBSD/OpenSSH/portable/ (capitalize openbsd) is
availabe, but it's a mirror, not the special old distfile holder.
Moreover, mirrors have good enough old versions,  and "old" subdirectory
have much old distfiles.