Bug#905885: diffoscope: allow overriding of @skip_unless_tools_exist to fail if tools are missing

[Chris Lamb]

tags 905885 + pending
thanks

Implemented in Git, now pending upload:

  https://salsa.debian.org/reproducible-builds/diffoscope/commit/50a9572b0c49ba02c2a2e8a19cb3b763c08a5339


Regards,

-- 
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     : :'  :     Chris Lamb
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