[rfc] add MK_TELNET_SSL as a build option

[Warner Losh]

> On Jun 13, 2015, at 4:40 PM, Adrian Chadd <adrian at freebsd.org> wrote:
> I'd appreciate feedback here as it does involve addin ga new MK, and I
> really dislike it. :(

Me too. However, in this case it seems necessary. You need to have a system
with SSL, but without SSL telnet. Perhaps, though, you on’t really need telnet
at all on these boxes?

> -.if ${MK_OPENSSL} != "no"
> +.if ${MK_OPENSSL} != "no" && ${MK_TELNET_SSL} != “no”
...
> -.if ${MK_OPENSSL} != "no"
> +.if ${MK_OPENSSL} != "no" && ${MK_TELNET_SSL} != “no"
etc

If MK_OPENSSL is “no”, then MK_TELNET_SSL is necessarily no.
Reduce this to just testing for that.

> .if ${MK_CRYPT} == "no"
> MK_OPENSSL:=   no
> +MK_TELNET_SSL:=        no
> MK_OPENSSH:=   no
> MK_KERBEROS:=  no

The last two (now three) are redunant because they are handled
below with the OPENSSL dependency.

> .endif
> @@ -312,6 +314,7 @@
> .endif
> 
> .if ${MK_OPENSSL} == "no"
> +MK_TELNET_SSL:=        no
> MK_OPENSSH:=   no
> MK_KERBEROS:=  no
> .endif

here...

Warner
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