Remove missing AES CTR compatibility hacks

[Peter Stuge]

Darren Tucker wrote:
> diff --git a/cipher-ctr.c b/cipher-ctr.c
> deleted file mode 100644

I can't really protest removing this file but I am sad to see it go;
that code helped me achieve compliance in another SSH implementation
for an environment only supporting CBC.

It was very helpful to have a reference for that exact case in OpenSSH,
and if there's a way to keep that around in some meaningful way I would
like that a lot, but I understand that OpenSSH itself no longer needs it.

It will remain in the repo history, but that can only really be found
by someone who already knows about it, it isn't really discoverable if
facing that problem the first time...


Thanks

//Peter