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OS X sed is documented as "-i SUFFIX", GNU sed as "-iSUFFIX". The one
consistent case seems to be "-iSUFFIX", where suffix cannot empty (or
OS X will parse the next argument as the suffix).

This used to leave around files named `refsout=` on Linux, and was
just confusing.

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>