Log Message:
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nhc: Add support for version flag without ".in"
This is my proposal for how to implement a "version" option for `nhc`
without having to turn it into `nhc.in`. I think it's important to
maintain the ability to run `./nhc ...` in a Git clone and have it do
something intelligent. So this adds a "post-install transform" step
to the normal Automake rules that updates the installed `nhc` in-place
with the full version+release string.