Re: tests: work around Tru64 sh -e issues for instspc*.test.

[Ralf Wildenhues]

Hi Eric,

* Eric Blake wrote on Thu, Jan 20, 2011 at 10:01:15PM CET:
> On 01/20/2011 01:50 PM, Ralf Wildenhues wrote:
> > Ahh, but it would have needed to be in that very patch, unfortunately.
> > As it is, my last patch fixed Tru64, but regressed NetBSD by roughly the
> > same number of failures, because `unset NOT_SET' fails there.
> 
> But bash 2.05a would dump core on 'unset NOT_SET', as documented in the
> autoconf manual.

Erm, old bashs set an error status, but don't dump core.  The core
dumping was, if I understand correctly, only with MAIL (and only that
variable) and only one specific bash version.  But I haven't tested
that now.  If things are different, I'd appreciate an update to
autoconf.texi.

Thanks!
Ralf