bin/brew: don't copy across zeroed env values.
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							@ -183,8 +183,8 @@ MANPAGE_VARS=(
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)
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for VAR in "${MANPAGE_VARS[@]}"
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do
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  # Skip if variable value is empty.
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  [[ -z "${!VAR:-}" ]] && continue
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  # Skip if variable value is empty or set to 0.
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  [[ -z "${!VAR:-}" || "${!VAR:-}" = "0" ]] && continue
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  VAR_NEW="HOMEBREW_${VAR}"
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  # Skip if existing HOMEBREW_* variable is set.
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