bug#27810: NS runtime feature detection

[Charles A. Roelli]

> Date: Tue, 12 Sep 2017 21:29:43 +0100
> From: Alan Third <alan@idiocy.org>
> 
> Well, the good news is that the patch was committed to master a wee
> while ago and the above command should build the dynamic version. It
> builds here on 10.12 with just a few deprecation warnings.
> 
> We’ve still not been able to confirm whether it works properly, so if
> you’d be willing to help us test it that would be great.

I found a little tool to help automate the dylib collection process
for creating a standalone app bundle:

  https://github.com/auriamg/macdylibbundler/

I haven't gotten it to work on my 10.6 system yet, since I have a bit
of a dylib hell from some botched library install attempts, that I've
never properly fixed -- and the tool can't fix it for me.  If I get
some time soon I'll try to build the master branch on a different
10.12 machine, then bundle the dylibs with the above tool, and try the
result on 10.6.