pathname.rb: Pass -s to du instead of -d0
pathname.rb: Pass -s to du instead of -d0

The option `du -s` is equivalent to `du -d0`. The former is a POSIX standard
(IEEE Std 1003.1-2008), whereas the latter is a BSD extension.

From the BSD man page:
`-s Display an entry for each specified file. (Equivalent to -d 0)`

From SUSv4:
`-s Instead of the default output, report only the total sum for each of the specified files.`
http://pubs.opengroup.org/onlinepubs/9699919799/utilities/du.html

Closes Homebrew/homebrew#16516.

Signed-off-by: Charlie Sharpsteen <828d338a9b04221c9cbe286f50cd389f68de4ecf@sharpsteen.net>

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