Bug#871029: BSD diff tool causes 5 errors in test suite

[Guangyuan Yang]

Source: diffoscope
Version: 84
Severity: normal

Some test cases failed when running diffoscope test suite on FreeBSD. Most of 
the issues are caused by the difference between BSD Diff (`diff` on FreeBSD) 
and GNU Diff (`gdiff` on FreeBSD).

Diffoscope should use `gdiff` when available. I will make sure that `gdiff` is 
a dependency of diffoscope in FreeBSD Ports. 

A proposed patch is attached. Not sure if this implementation is clean enough 
though.
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