Cheng XU ce00a94737
remove extra command output when running brew list -v <formula>
`brew list -v <formula>` is used to list all files inside formula's keg.

However since 70b93f65eab70cd84d221059a2864a52202df141, an extra
`find /usr/local/Cellar/<formula>/<version> -not -type d -print` will be
printed out. Fix the problem by using `system_command!` instead of
`safe_system`.
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