When producing the list of directories containing binary packages, do

some extra processing to ensure that we have a list of unique directories.
Otherwise we end up with two problems:

  - cache files get rebuilt all the time because they get built once for each
    path to the directory in question and since the path ends up in the cache,
    it is always declared out of date.

  - we end up with multiple links to the same binary package in the README.html
    files.

Committed during the freeze becuase this is a real bug which is encountered
daily.

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