bug#24256: new module for grep's DFA matcher

[Paul Eggert]

Jim Meyering wrote:
> Sounds like it must be something fundamental. I've just confirmed that
> at commit v2.25-100-gcd8082e `./bootstrap && ./configure && make &&
> make distcheck` succeeds on both Fedora 24 and Debian unstable.
>
> Did you rerun ./bootstrap?

Yes.

I think the difference is that I'm not running plain 'make' first. I jump 
straight to 'make dist'. That is, from a fresh copy of grep (same commit as 
yours), I run:

./bootstrap && ./configure && make dist

and this gets the tight_scope failure I mentioned earlier, on Ubuntu 16.04.1 LTS 
anyway.