Record all available sources for descriptions

Avoiding duplications is one thing, but it could also be handy to know
all sources for a description so that you can e.g. avoid opening another
file or similar such if its also present in one you already have open.

Given how the structures were set up this was probably intended all
along and either worked at some point or was abandoned for the
duplicates that we started culling heavily with the introduction of
MultiArch as at that point they blew up the cache and needed to be dealt
with.

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