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This is really just syntactic sugar for running `env -u VAR ... COMMAND`, but env(1) is inconvenient when the form of the COMMAND is not known: if the COMMAND might contain an equals sign, you end up having to run `env -u VAR sh -c 'exec "$@"' sh COMMAND`. Let's make this simpler. This follows up from GHSA-4ppf-fxf6-vxg2 to fix an issue that I noticed while resolving that vulnerability, but is not required for fixing the vulnerability. Signed-off-by: Simon McVittie <smcv@collabora.com>