K 10
svn:author
V 4
bapt
K 8
svn:date
V 27
2020-06-01T09:01:13.833183Z
K 7
svn:log
V 318
Restore compatibility with GNU diff regarding --label

Various options to "diff(1)" show filenames, and traditionally make use of the
"--label" parameter, if set.

Restore this behaviour in BSD diff.

While here add a regression test

PR:		244533
Submitted by:	Jamie Landeg-Jones <jamie@catflap.org>
MFC after:	3 days

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