[PATCH] specify minimum required version of GnuTLS

[David Woodhouse]

On Wed, 2017-07-19 at 10:47 -0700, Daniel Lenski wrote:
> +  <ul>
> +  <li>Recent versions of OpenConnect require GnuTLS v3.2 or
> newer.</li>
> +  </ul></li>

If we're going to do that then at the very least we should update the
pkg-config check in configure.ac accordingly. And there's a bunch of
actual code to support 2.12 still, which we can rip out.

Or it's probably actually a fairly minimal patch to fix it up to build
again.

However little work it is, I'm certainly not averse to this being the
last straw for killing 2.x support — I've been threatening that for
ages anyway. I hadn't necessarily planned to go all the way to 3.2
though. What platforms do we leave behind if we do *that*? Nikos?
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