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Before we start using this, should decide where to put stanza.

One of following seems okay:

preserve_rpath
skip_clean "bin/foo"
link_overwrite "bin/foo", "lib/bar.so"

or

skip_clean "bin/foo"
link_overwrite "bin/foo", "lib/bar.so"
preserve_rpath

Went with former as putting preserve_rpath and skip_clean near each other makes sense to me as they handle brew's internal modifications to keg files.

And having skip_clean next to link_overwrite as both take a list of files.