[rfc] add MK_TELNET_SSL as a build option

[Poul-Henning Kamp]

--------
In message <14F5785C-E07D-4573-8659-AFBB90271B3F at bsdimp.com>, Warner Losh write
s:

>> 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. :(

This reminds me:

   Somebody should really adopt src/tools/tools/build_option_survey

and run it periodically so people can find out the space cost of
the various build options.

Here is a very old output to show what it produces:

	http://phk/misc/build_options_stable_8_210741/


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