[diffoscope] branch master updated (5b4c6c2 -> d84c49e)

[Ximin Luo]

Mattia Rizzolo:
>       from  5b4c6c2   Drop unused imports in Ar comparator.
>        new  d84c49e   Drop ar from RequiredToolNotFound.PROVIDERS as we don't use ar(1) directly

Shall we also get rid of the Tar PROVIDERS and any other redundant things as well, then? If they are left in there, future contributors like me will also be confused.

X

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