Bug#926760: install-info: GZIP environment variable warnings on buster

[Scott Kitterman <debian@kitterman.com>]

Package: install-info
Version: 6.5.0.dfsg.1-4
Severity: normal

Saw this in the apt term log from a Stretch -> Buster upgrade today:

Setting up libxmlrpc-lite-perl (0.717-2) ...^M
Processing triggers for sgml-base (1.29) ...^M
Processing triggers for install-info (6.5.0.dfsg.1-4+b1) ...^M
gzip: warning: GZIP environment variable is deprecated; use an alias or script^M
gzip: warning: GZIP environment variable is deprecated; use an alias or script^M
gzip: warning: GZIP environment variable is deprecated; use an alias or script^M
gzip: warning: GZIP environment variable is deprecated; use an alias or script^M
gzip: warning: GZIP environment variable is deprecated; use an alias or script^M
gzip: warning: GZIP environment variable is deprecated; use an alias or script^M
gzip: warning: GZIP environment variable is deprecated; use an alias or script^M
gzip: warning: GZIP environment variable is deprecated; use an alias or script^M
gzip: warning: GZIP environment variable is deprecated; use an alias or script^M
gzip: warning: GZIP environment variable is deprecated; use an alias or script^M
gzip: warning: GZIP environment variable is deprecated; use an alias or script^M
gzip: warning: GZIP environment variable is deprecated; use an alias or script^M
gzip: warning: GZIP environment variable is deprecated; use an alias or script^M
gzip: warning: GZIP environment variable is deprecated; use an alias or script^M
gzip: warning: GZIP environment variable is deprecated; use an alias or script^M

I checked and libxmlrpc-lite-perl doesn't make reference to a GZIP environment
variable.  texinfo does.

Not urgent, but looks like something that should be addressed in the next
cycle.

Scott K