K 10
svn:author
V 6
kevans
K 8
svn:date
V 27
2022-09-18T06:28:50.958725Z
K 7
svn:log
V 527
zdiff: avoid non-conformant features

`setvar` is a non-conformant feature that looks slightly neater but is
not portable to other /bin/sh implementations.  Making the script
portable is straightforward, so let's do it.

Tests are added to make sure that I didn't break anything major in the
process.

Reviewed by:	bapt (previous version), jilles
Sponsored by:	Klara, Inc.

(cherry picked from commit 5b7adeb1845c7491a655d2b2e1ab55d7b7b96a34)

Git Hash:   56f9e6ff1dcaa23928089e382c6e21cf821b9ca1
Git Author: kevans@FreeBSD.org
END