bug#81766: gzip-1.14.96-72fa on bi-arch machines

[GNU gzip discussion and bug reports.]

Paul Eggert wrote:
> I fixed the problem there by installing the attached, which alters the test 
> cases to not be so picky on these platforms.

I confirm that it fixes the test failure on Solaris 11.4, but not on
Linux (Debian 8)/s390x.

Bruno