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

[Chris Lamb]

forwarded 905885 https://salsa.debian.org/reproducible-builds/diffoscope/issues/35
thanks

I've forwarded this upstream here:

  https://salsa.debian.org/reproducible-builds/diffoscope/issues/35


Regards,

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