[PATCH 1 of 2] subrepo: use unset instead of env -u to fix test on BSDs (issue5229)

[Augie Fackler]

On Fri, May 06, 2016 at 10:59:29AM -0500, Kevin Bullock wrote:
> > On May 6, 2016, at 10:36, timeless <timeless at gmail.com> wrote:
> >
> > https://www.gnu.org/software/autoconf/manual/autoconf-2.61/html_node/Limitations-of-Builtins.html#Limitations-of-Builtins
> >
> > The correct approach is to do construct a subsetted env and use env -i.
>
> It looks like that's only an issue with really ancient shells (Bash
> 2, others unspecified). I'm inclined to say we don't care if someone
> sees a failure running the test suite on FreeBSD 4 or something.

I'm going to queue these as-is for now. Thanks!

>
> pacem in terris / мир / शान्ति / ‎‫سَلاَم‬ / 平和
> Kevin R. Bullock
>
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