Are we going to have a no-NTS-KE build option?

[Hal Murray]

I'm thinking of updating INSTALL and/or devel/hacking.adoc to say something 
about pthreads and OpenSSL.

If we did away with shared key authentication, we could potentially do away 
with needing libcrypto.  Aside from authentication, we also use RAND_bytes() 
so we would need to substitute something for that.

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