[Toybox] FreeBSD porting, removing bashisms

[Rob Landley]

On 04/21/2016 09:30 PM, Ed Maste wrote:
> On 22 April 2016 at 01:22, Rob Landley <rob at landley.net> wrote:
...
> Anyhow, for my exploration I installed gsed and s/sed/gsed/ in
> scripts/make.sh. We'd like to improve compatibility with GNU sed where
> feasible though and I'll try to see what is being used here that we
> don't implement.

I made sure toybox builds with toybox sed, but that's just gives us a
chicken and egg problem.

I'm trying to work out a way to build toybox sed standalone without
first running the build scripts, preferably _without_ snapshotting
output files from "generated/*".

It's... nontrivial.

Rob