hg: jdk/sandbox: 8243656: Shell built-in test in configure depends on help

[chris.hegarty at oracle.com]

Changeset: f5373fc53bed
Author:    sgehwolf
Date:      2020-04-27 11:00 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/f5373fc53bed

8243656: Shell built-in test in configure depends on help
Summary: help might not be available to check for built-ins: Use 'command -v' instead
Reviewed-by: erikj
Contributed-by: Michael Zucchi <notzed at gmail.com>

! make/autoconf/util.m4