[PATCH] readelf: Hook up -g, --section-groups to display the section groups.

[Mark Wielaard]

On Thu, Nov 30, 2017 at 12:14:07AM +0100, Mark Wielaard wrote:
> It was already possible to display the section groups using -a, but
> the argp options didn't yet have an -g, --section-groups entry to
> just display the section groups.

Pushed this to master.